I agree totally with misti. From the comments you posted, this isn't harrassment, just thoughtlessness or nastiness. Going above her head to her boss will make you look like a whiner and a troublemaker. If her comments bother you that much, talk to her; she either doesn't realize how thoughtless she is or is trying to provoke you. My suggestion would be develope a thicker skin. No matter what the issue, someone is always going to be nasty about something. Making the general statement that "fat people bruise easily" is *****y, but not actionable.
Mel

and loses someone respect.
But it's just my opinion... hey if you really want to go for it, good luck!!