I have a personal code for myself, one part of it is that I do not engage while frustrated/angry/etc, to me it is similar to the medical phase "Do no harm"

Bottom line is you are being taken advantage of you and things are supposed to be consensual between both parties, and it does not seem like they are in your case.
I'm a trans woman domme (interested in other transgender/nonbinary/females), this is inappropriate behavior, but these apps tend to get Read more… flooded with people performing financial domination. Now, if your into that, fine. I do wonder what kind of toys you had to buy for her. If it was basic stuff like a whip, she should really have that. Ask her some basics she should know (like what a sex menu is, how to perform certain kinks safely) and look into what red flags you can spot to find out what a fake domme is. For the record, I've done a mix of in-person and real life domination for about 10 years, and I've never felt the need to tell a sub to purchase things for me. As others have said, get away from this woman. I understand attachment can be a thing, there's actually some science behind it, but sometimes you need to cut the strings. I've gone on long enough about this.