The best way you can help your daughter with her self confidence issues is to teach her and show her how to love herself even if you have to be her guide. I would first start by just acting normal, casually ask them what makes them feel bad about themselves help yourself understand. With most teenage girls boys and friends have a very big hold on there life and they may want to fit in. Help them change there style if they want teach them the works of makeup help them boost there confidence and most importantly keep her busy ! Never let your child stay in bed for to long especially with self esteem issues it can and will lead to depression.