I'm not sure why everyone's thinking she can't buy insurance. She can, she's just self-employed so her options are going to be expensive and presumably less-awesome than her current coverage. As others have said, unless we do get married, she'll probably just be getting a catastrophic plan (possibly with ACA subsidies, haven't done all the math yet, and "unfortunately" her income is a lot higher this year than previous) since she's young, healthy, no prescriptions or chronic issues, and this crap is expensive.
I have my own opinions about healthcare in this country, but let's please not get political in this thread...