Piano is not her interesting point. You need to find out what's

No matter what, you push her that not her interesting area, the result waste time and money.

Boy/girl who built differently.  My neightbor has 2 girls and 1 boy and everyone learn piano and quit after year or two.  But all kids are stright A student, good in reading/writing. 

She doesn't not play piano that may not a bad thing, you need to open another window for her.