This leads me to suggest a bit of a different angle. I agree that your response was just right, and it seems like you might have gotten through to her. I’d give her one more shot, if she texts you again about going out. Not that the rest wouldn’t bother me as well, but she may just be a kid who doesn’t realize that it’s right to offer / be grateful. I can think of some things I did in my early 20s that I would do very differently. You could even respond to her text next time by saying “sure, come along. your turn to cover the tolls!” or something similar.
Good luck, whatever you decide to do!