stellat,
my son was very skinny too. he is 6.5 years old now. he still drinks milk. i have put him on 蒙牛 full milk for the part 5 months. he used weight 40lbs. Guess what, he weight 57lbs now. it is kind of scary. he drinks at lease 4 to 5 boxes of 250ml 蒙牛 full milk per day. before bed, he still takes a full glass of formula milk. i think if your daughter still drinks milk, try to encourge her to drink 蒙牛. i hope she will do fine.