Her first response was feeling cool and flattered that she was asked. But she is 9. I remember a kid in high school approached me in the library. She was really struggling in math. I wanted to help and spent my free period helping her to understand something basic. She was on the non university math track which led to fraction rules in grade 12. It was satisfying that I helped her but I really did not want to spend my future free periods doing this. And it was a struggle. She had a hard time with any concepts let alone math.
I think DD is thinking that they spend a few minutes on math and then have a playdate. She doesn't quite get how a kid doesn't get math.
