Hi that’s good you see her regularly. Could you not look into some group activities in your area for when you have her at yours. I’m sure there must be some clubs on at the weekends that she might like to do. The things you like doing with her sound like just you and her. Swimming park and bouldering..does your climbing club have some classes for thexample kids I know mine runs them on a sat and Sunday mornings. Or maybe try some other things I’m sure there must be some local clubs on she might like. Good luck and I’m sure you’ll find something and it would be nice if she had a little friend for when she comes to yours.