Suggest Remedy For Low Body Weight And PCOS

my daughter is 14 and has been going through an eating disorder for about 1 year is at a low wieght now but is slowly getting well we have just found out she may have polycystic ovaries she has no symptoms outwardly and was never overweight to begin with,her periods started when she was just 9 years old and were allways very heavy and iregular at present she is not having any becsause of the eating disorder ihave seen alot of information on people being overweight with polycystic ovaries not so much on teens being of low weight she is at present not able to put weight on is just about maintaing im confused and so is she help