Read this, and tell me what do you think about this. how do you feel if someone calls you fat?

Really, thats very disrespectful that she said that. She obviously dosnt have a filter and I think you have every reason to be upset. Best thing to do, let her know that what she said wasn't cool and really uncalled for. Let her know it offended you but do it in a calm way so she (and yourself) dont become defensive. Good luck!!