> While I fully support her passion
This is not a criticism of you; I understand you're trying to do your best for someone you care about, which is laudable in itself; but there is something I think needs to be pointed out.
You did not say "I fully support her rational and well-informed career choice". Probably you would love to be able to say that but, well, it wouldn't be true.
There is a meme floating around at the moment that passion should be the deciding factor in career choice. Every society has its characteristic errors, and this seems to be one of the more harmful ones of 21st-century Western society. In reality, emotion should be an input, yes, but not the only or necessarily decisive one; our emotions evolved in a very different environment, after all, and they don't actually know very much about what's going on today so it's hardly surprising that they often make bad decisions.
Another common wording of this meme is "do what you love". Put that way, it's easier to see why it's bad advice for most people. If you love doing something, probably lots of other people do too, and they'll bid down income and working conditions in that field until your life degenerates into miserable slog.
The obvious reply is that if you end up in a job you hate, your life will also degenerate into miserable slog, which is true. You don't want to end up in a job you hate if you can avoid it.
The best career choice is usually somewhere in the middle: try for something you don't mind doing that will pay a decent wage for no more than forty hours a week without unreasonable demands. If your passion doesn't offer a realistic prospect of that, then it's probably time for reason to overrule passion.