Tore

I think he means she traded stocks in South Korea,  A SK investment company wouldn’t issue a 1099 since that’s a US thing. But she can probably find out amounts she earned/lost from the trades during tax year 2021 and report them.
 
@Tore
Report her wages from a job on Line 1 with your wages. I don’t know TaxAct so can’t tell you how they will collect that figure to add it to Line 1. Exclude her wages from abroad using form 2555.
Report any interest or dividends she earned in 2021 on Schedule B. Those are taxable. Just list the payer and the amount even though you have no 1099.
Report gains/losses from stock sales in 2021 on Schedule D. Also taxable.
 

1.  To be perfectly clear, she will be considered a resident alien for tax purposes if you file a joint return. 
2. The 1099s must come from the investment income source.  You can't make your own. 
3.  Did she generate income from the property?  If not, there is noting to report on the 1040.
For IRS reporting, you include/report income, not wealth.   Foreign assets and bank accounts are reported via an FBAR, if applicable, to the Department of the Treasury.  

This seems to be the consensus. I can too, I have the letterhead they require from my supervisor stating it's my role is permanent and that I make above the poverty level.

CURRENT annual income is king.  Past years' income is useful only to determine stability.
Current annual income is calculated as:
Current weekly income x 52 = current annual income
Current monthly income x 12 = current annual income
Current pay period income x number of pay periods per year = current annual income
 

But your spouse was not authorized to work so his income doesn't count.

If you can prove your job is stable and sufficient now, that’s all matter.

Future income cannot be used to support you now. Neither can past income. They will care about current income first. At the time you present the I-134, it needs to show the petitioner's current income...that is how much they are earning at that time. The past income may be considered for the public charge piece as well, but current income is what is required.
 
One of the documents to use is a letter from your employer that outlines your current income, your position and when you began your employment. Here is an example such a letter.
 
Company Letterhead]
 
Date: [Date of issuing employment verification letter]
To Whom It May Concern:
 
Dear Sir/Madam,
This is to certify that Mr./Miss. [First Name] [Last Name] is an employee at [Company Name] and is working as a [Designation] since [Date]. This is a permanent position with advancement potential. [His/Her] current gross salary is USD [xx,000] ([salary in words]) per annum.
 
If you have any questions regarding Mr./Miss [First Name]'s employment, please contact our office at [Office HR Phone Number].
 
Sincerely,
 
 
[Signature of person issuing this letter] 
[Manager HR] or [Designation]

Option 1) Marry and add to spouse's plan
Option 2) Purchase insurance on the exchange (healthcare.gov)
Option 3) Private insurance
 
Normally #1 is the best value, followed by #2, with #3 tending to be the worst value by far.

Most people seem to marry asap and then get added to their spouses coverage.

I was able to add my wife to my insurance retroactive to our wedding date, so we just got married quickly (3 days after her POE) and rolled with it.
Which if you can do it and are comfortable with doing it, it's probably the most straightforward thing to do, though we might have been more anxious about that now.

Thank you, I didn't know this and I updated my profile too.

This is only true if they stay in the US after marriage, to adjust status. People get married in the US on tourist visas all the time, and return to their home country before the I-94 expires.
Since you both live in your fiancées country you can book a round trip together and proof intent to return after marriage in the US.

It could be fine. it could be a reason to deny under the public charge rule. It's the CO's call based upon a totality of the circumstances.
They will take into account age, work history, etc. A fairly recent student who didn't work for a couple years is different than a 50 year old who hasn't worked in a couple years.
 
Public charge criteria from the FAM: https://fam.state.gov/FAM/09FAM/09FAM030208.html#M302_8_2_B_2

If I left the nickname off of the forms.. What about the secondary evidence we will be using for the visa interview? Any correspondence would have "Casey" on it. Also, my fiance would likely call me "Casey" when being interviewed, since he is not accustomed to saying Cassandra (he does know my real name though). Would this cause a problem with the consulate employee who performs the interview?

I would do it this way:
 
On Page 4:
 
Residence 1
50.a. State: MA
50.b. Country: United States
 
Residence 2
51.a. State: CT
51.b. Country: United States
 
On Page 8:
 
Residence 3
51.a. State: CA
51.b. Country: United States
 
Residence 4
51.a. State: Victoria
51.b. Country: Australia
 
Residence 5
51.a. Province: Gyeongsangbuk-do
51.b. Country: South Korea

Yes.  I promise that the adjudicators at USCIS are not prepared to read petitions in Hangul.

Have you considered getting married in Korea and filing for a spousal visa at the uscis office in seoul?  You might be eligible depending on your residency status.   You might be happier in the end if you do 

Two. Name and address in native alphabet are both asked (or were as of last year).

Welcome to the forum. The answers given are for K1 visa, yet you have IR1/CR1 listed on your timeline? Which visa are you going for? While on that subject: *Form I-129 is for Non-immigrant Worker, Form I-129F is for K1 Alien Fiance(e). You need to get that corrected/updated.
 
Good luck on your immigration journey.

Theyre not concerned with what your income WAS, just what it is at the time of interview and going forward.
 
With the exception of 2016, you were above the poverty line and it wouldnt be an issue.
 
If your current/present income is not stable or above the guidelines, getting a co sponsor would be a good idea.