My girlfriend doesnt like her body?

okay just to let you know my girlfriend is mixed and shes the most beauitful girl in my eyes shes only 18 and she does not like her ,and she thinks shes fat.Ok so she has black in her okay of course shes gonna have a but she doesnt like it and wishes she had a white girl plus she calls herself fat all the time and thinks it because i admit she wanted me to help her work out because i work out all the time so i offered and then i told her to get her fat a** up and run because we were jogging and she was actin like she couldnt run anymore shes 5'2 tiny only 110 pounds i was just playin when i said that and i also said one time lol when she was like im so fat i was like come here fat a** and give me some love lol and she got mad.OK she is a beauty she has these big wide blue eyes and i love her i dont see what her problem is with her and every time i smack it group her she says stop and laughs i dont know why can u help me!?!