Our 17 Year Old Daughter Has Had Cracking/popping In Her

Our 17 year old daughter has had cracking/popping in her spine when she breathes for the last 8 months or so. She complains that it hurts. We can hear multiple cracks when she takes a deep breath. I have taken her to a sports therapist who said she had ribs out of place. She was adjusted but it keeps popping and hurting her. Do we need to look for more answers elsewhere? We were asked if she is well hydrated and she is. She is 5'7" and 120 lbs.