What is the financial responsibility that comes with green card sponsorship? please read the details.

Asked in Dallas, TX - 4 months

I am a US citizen and I'm trying to complete all the needed forms to sponsor my mom, including form I-485 because she is in the US. Two weeks ago, I had to take my mom to the emergency room because I thought that she had a stroke, but thankfully it ended up to be Bill's Palsy. My mom doesn't have medical insurance in the US, so the hospital said that they typically try to collect, but they end up writing the charges off. My questions are 1. Will this event affect any of this process? 2. Could that eventually affect my credit because I'm sponsoring her? 3. Will I be liable for that bill or any future ER bills if I submit form I-864? 4. After getting the green card, can I apply for Medicare or Medicate for her to be used for emergencies like this in the future? Thank you