Her complete dismissal and getting defensive at your feelings at the situation is unnerving and completely uncalled for. Relationships are about compromise, and it seemed as if the original compromise was "partner does whatever she wants and OP just has to put up with it". The actual end result is a bit better, but it still doesn't really resolve the issues at hand. She's still doing whatever she wanted in the first place (thirst-trapping), just now it's on a separate account which can cause its own problems. As long as she's transparent (which it seems she is, a pretty good sign), I'm sure things won't go too poorly if this "compromise" works out, but it still seems like she still just got the outcome she wanted and you're finding a way to pretend to be okay with it. Hopefully you don't see things the same way and actually are fine with the end result, though.