Having close emotional ties with family and friends is so important, and I'm sorry that the relationship is strained between you and your cousin.

Why is it that you don't have "normal access to playgroups, amenities, activities, etc"?

It's great that your cousin and best friend is there for you and that your mental health has improved, that must feel awesome! Can you help your daughter in the same way? Be there to validate her feelings (you can validate a person's feelings even if you don't agree with them or feel the same way).

Maybe you feel safe now, but your child does not. She needs you to be that safe place where she can be herself and be accepted for who she is and how she feels. Maybe you can get out and find a playgroup or a way to be social that she really loves... and it might make you a bit uncomfortable. But it also might help your daughter to be more tolerant of time spent with her cousin. But at 5 or 6 years old, not all kids can spend hours with people they don't care for- why put her in that situation? Maybe short, planned visits to your cousins place would work. And ending the visit before any problems or complaints come up, or before your daughter asks to leave could be helpful.

This may be totally unrelated, but I don't feel 'safe' (ie. trust a person) if that person is treating me with dishonesty. The title of this piece is not honest. You said yourself that your daughter has no complaints about your cousin, yet the title says she hates your BFF... I love Modern Parent, but this title is kind of click-baity and should have been changed to reflect what the story is actually about.