I've had a very similar situation myself, as well. I had a girl literally blurt out one time, "well.. when are you gonna spend some money on me?", and I was like, WTF? this was after we had been going to the movies 1-2x a week, I took her to a nice Greek restaurant, etc, and its like, ya know, its great that you S the D and all this shit, but did you just complain that I'm not spending enough money on you??! f that noise.
kids don't help that situation
So, she fully knows she makes more than you, yes? I mean, I've dated quite a few girls who made less than me or much less than me, I really didn't expect them to pick up the tab at all. I only dated a woman who made more than me like once, and she was awesome in that we would just arbitrarily pick up the tab on shit goign back and forth - that felt natural, normal, and reasonable and it never even had to be a topic of discussion honestly.
Something about this girl and how she is acting is definitely concerning. How old is she Max? has she been in a many serious relationships before?