Is my friend fat??!!?

i have a friend that i kinda barely know and she doesnt have a yahoo and her name is lauren and she wanted me to ask if anyone thought she was overweight and if she was what to do. She is 115 ponds and she said it varieys sometimes between 111-116. She is kinda tall like 53 or something and she has big idk wht do u tink is this normal for her for a 13-14 year old for her?