Everything will be alright..we only think that we can not move on but everuthing happens for a reason if she is not happy with ex she must not put much stress on her mind 
tell her not to worry.. The same is happening ti o me i have to leave him for good but i know i can move on easily love happens many times in life but ppl change ..Love happens once this statement is totally wrong May Allah bless her and her new rishta