Let me say that it is very unusual for parents to involve themselves this much into their child’s life when she is a grown adult, over something like Tinder. Even if it were not an issue with “tinder”, it could have been something else and the same scenario would play out. I’m sure she is great in every other aspect but this is a significant thing to think about, especially after 10 years.
Contact Tinder again. Go full Karen. Escalate the issue. Demand the profile be taken down.
Any money it’s the cousin.