Focus on that in a major way. Things could be so much worse.
Sounds like her financial situation (and by extension, yours) is now quite complicated.
I’ve never dealt with one, but aren’t there things like financial advisors that might be helpful in cases as complex as hers? Then again, I’m not sure how much they charge, or if there would be free alternatives. And since your finances are kind of intertwined, the advisor would likely want to see you together for a full picture.
But like @Mark_Asher says, you don’t want to be making hasty decisions right now, especially when it comes to buying/leasing cars. I haven’t bought a car in years, but I remember the decisions being highly stressful, even under the best of circumstances.
Also, my girlfriend also has severe anxiety disorder(s), so I can kind of relate to the stress that extends to you.
So all I can really do from here is to extend the both of you my sincerest best wishes.
Look forward to when all of this settles down. It will get better.