My Daughter Had Lapband Surgery 2 Years Ago. She Lost

My daughter had lapband surgery 2 years ago. She lost around 60 pounds. Four months ago she was having stomach issues; hospitalized; saw all sorts of specialists who could find nothing. Now she is eating as healthy as one could eat and working out 4 times a week but is gaining weight. She is, understandably, very frustrated and upset. Any thoughts?