I mean, definitely better than the apps where people will tell her to unalive herself, but tbh it sounds like she really doesn't have the... skills? boundaries? luck? je ne se quois? to do well with internet-started relationships right now. She's had two long-term internet relationships that both went bad in the same way when they met in person; there's something going on there other than just her size, which presumably the partners at least knew about in theory. So I kind of think that if there's any way at all she can manage meeting people in person first, it might be a good idea to try that for awhile. At the very least it will remove the fear of people pulling the rug out once they meet her, if they meet before she even puts a rug down.

And even if she doesn't meet a partner that way, she might be able to start building an in-person support network other than a romantic partner, which will be all the better for having a healthy relationship when she finds one.