I understand that as a parent, you want her to be able to speak fluently, but you shall not expect to go away, It's a neurological condition. She may be in progress of development, so stutter would go away at god know what point, or it will always stay. You need to learn how to support her then 'cure' her. Otherwise, she will be deeply hurt by you. She sounds like my situation when I was a child, I even had 2 years of no stutter before suddenly coming back. I am 28 now, and I barely talk to my mom because of the exact same reason I said above.