genddob

Marriage is for better or for worse. Family is family. I went home overseas for 8 months to take care of my mother when she was diagnosed with a terminal illness. I wasn't married at the time, but I think I would have done the same if I was - she's my only mother and it was my duty and privilege to take care of her before she died.
Different situation in that your MIL isn't going to die imminently, and that must be the hardest thing for her and for you - there's no end in sight. Only you can decide what you want to do. I think it's unfair to assume she doesn't love you enough to leave her mum or that she intentionally changed her plans.

She's not a "young girl" - she's a 23yo mother of a 4yo who has been married for over a year or two to an old man. She's savvy enough to have got herself over here just in time. Regardless of her true motives, agree that if he's incoherent, there's no harm in leaving his bedside to get started on a job and somewhere to live, esp if as it sounds like, the daughter will cut off the hotel payment as soon as he dies. I can't see that any good will come of the OP getting involved.

I have had 4 E-3's since 2008. I now have a green card after marriage to a USC. What do you want to know? I got my first one in Australia and since then have got the rest in Toronto. One was a new one (same employer, different job), the rest were E-3R (renewals). The longest part is getting the appointment in Toronto. The LCA generally takes 7 days or less online. Apart from giving a job offer letter, that really is the extent of the employer's obligations (unless they agree to reimburse your trip/s to get/renew the visa.

Gah - get an E3!!! You do not need to be "sponsored" for an E3!! The employer must apply online for an LCA but that's it. Their obligation is to give you the LCA and a job offer. The rest is up to you. It's cheap, fast, you can be working for them as soon as you can get an appointment at a consulate outside the US.
The word "sponsorship" conjures up in the employers mind getting labor petitions and thousands of dollars of lawyer fees etc. This is NOT required for the E3. It would be a MUCH better option for you.

I would report it and also not go to the removal of conditions interview etc, if ONLY because you are on the hook for the I-864 support as long as he has a green card. Plus, it would really upset me to be used for a green card.
Sorry you had to go through that. Divorce him and move on. You're a USC and a big girl, so move back where you are familiar with the area and rebuild your life.

VieSoCal-
a) Write the address you now live at where you want the documents sent.
b) Yes
c) The US citizen fills out this form. It says list the spouse of your relative (you). So list your husband's information.
d) Yes. What else would you put if you've never lived anywhere else?
e) Well, where do you live? Write that office down.
f) Last occupation ie job. It's not a trick question. Write what you were last employed as.
g) Yes.
Just answer the questions as written and do not try to think about what they "mean". They are straightforward questions. The instructions page tells you how to complete.

If using assets instead of income to meet the requirements, you must show assets equal to FIVE times the poverty level for your household size, not 3 times.

Yes it's normal. I have had BCG and have huge reaction to TST so no longer get them. For the AOS medical I had the Quantiferon Gold blood test drawn instead which gives definitive no (but I'm pregnant and didn't want CXR which is much cheaper usually).

http://www.cdc.gov/immigrantrefugeehealth/exams/ti/civil/vaccination-civil-technical-instructions.html
Vaccines require vary by age. For most adults-
Hep A
Hep B
Tdap (tetanus, diphtheria, pertussis)
MMR (measles, mumps, rubella)
Varicella

You can submit the last 3 years tax transcripts.
You can get a blood test done to draw titres and see which vaccines you have immunity for (Hepatitis, measles, rubella, varicella etc) and then you know which you need. You can also get a blood test (quantiferon gold) instead of the skin test/CXR to show you are clear of TB. THe blood test for TB is more expensive than the skin test though.