There is no clear cut answer to this.
Each person learns differently and at their own pace.
I for one am a visual learner. I need to see it done first then I go and do it on my own. I remember by seeing and then doing.
I am not book smart. Meaning being able to read something and retain it visually in my head.
So what I am suggesting is ask your daughter how she perfers to learn. There is a method to getting to know how you retain information that is presented to you. You have to find out what it is and then keep at it.
If that does not work then it is simply motivation and or subject matter.
If you want to learn something you will. Simple as that.