She can regain her strength by eating the proper foods. There should be someone with her who is willing to help her get stronger, comfort and take care of her. That someone should give her encouragement. Remember to pray to God. Ask for strength, guidance and protection from all dangerous acts. 
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The effective way is to share her problems with someone close like your family, siblings and can also be the one you trust your best friends. If she try it, she will feel more lighter and better. And also seek advice to others.
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