You already gave her the best advice... The rule to leave....

If you are not being treated right. leave

If your love is not reciprocated. leave

If the person you want wants someone else. leave

If misunderstanding and fights are more than the happy days. leave! cos love understand and true lovers rarely fight because they won't want to hurt or make each other sad.

It is hard to leave, but it is the best thing to do, and time will make us realize we took the right decision... We can't force others to treat us right or love us...

Teens is when most people's hearts get shattered, she will survive it and also learn from it...

People in love are also the hardest to advise because whatever you tell them always go to the bin when they see the person they love. But then, if she has that rule in mind, she will leave when her heart can't bear the pain anymore...