US Immigration from Malaysia

I don't know what to do. We married on March 17th and had it recorded on March 18th. Here visa says its vaild until the 23rd. We just got a letter saying we did not marry within 90 days. Did we do something wrong? Did they do something wrong? I'm very worried. We submitted a copy of the married certificate with the i-485 form. Did they read the dates wrong?

The fee for I-485 applications includes the cost of the I-131 and I-765 (no need to pay for them if filed with or while your I-485 application is pending adjudication)

Is this still accurate? Doesn't appear to be so

"If you filed Form I-485, Application to Register Permanent Residence or Adjust Status, with a fee on or after April 1, 2024, and your Form I-485 is still pending. $260"

https://www.uscis.gov/feecalculator?form=i-765

We just got married so I'm (american citizen) am wanting a healthcare plan to cover my wife and her child. I'm going through the healthcare marketplace to do it. I submitted the application and it said we are eligible but her child isn't? But "May be eligible for Medicaid based on this month's household income".

Kinda confused by what this means. So if I enroll in a plan, our daughter won't be able to use our plan for free check-ups and such? Is medicaid/chip even available to her as a non-citizen or green card holder? Do I just need to call the marketplace, or is there something else to it? The "next steps" section for her says "Wait for more information from your state agency about Medicaid coverage. You may need to provide more information to the state.". So maybe I just wait?

I googled this for 30 min and couldn't find answers. I read before its easier to change name during marriage as opposed to any other time, but I can't find information on how thats done. We live in Alabama.

Also, is it ok to do this before she gets her SSN? We applied for it 10 weeks ago but still haven't received it.

My petition isn't approved as of right now, but I am asking in advance. Since the new I-485 for AOS cases has integrated I-864W into I-485, that leaves the consular cases out. Will I-864W still work on the consular side for those outside the US, or do I have to do I-864? (Filing for children only)