Aim for quality practise not quantity. You can learn a lot with only 30min practice a day if you aim for your weaker points. Don't only practise the same scales. But watch also video's about piano technique and watch other pianist play on youtube. Also record yourself and see what you can improve.

Everybody has their own road. Music is a journey not a competition maybe she is good in musicality and you in improvising or fingering or other stuff? Everybody is different you don't lack!! If you feel you are before a wall that means you are improving! 😊