K.W.
I don't really have any information on being tongue tied, but my son did not nurse well at first either. He did not have anything wrong with his tongue but he never did nurse from my breast alone. The lactation consultant I saw gave me a nipple shield that made my breast feel more like a bottle nipple and he nursed great from that day until 15 months. You might want to try that and see if it helps her nurse better. Good luck.