What should I say?? or should i say anything?

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My father recently came to visit me and meet his new granddaughter. We dont get along too great but i made the best of a weird situation. Anyways to make a long story short, my grandmother called me yesterday and was complaining and being mean basically saying 'how much weight' ive put on. My father whom is just about 450 lbs told her that not much has changed i just got fat. LOL.. usually i don't let things bother me. When i lived with my dad he used to say the same thing and i weighed 130 lbs. So instead of having image issues with myself because of TV i have it due to my family. Anyways she didnt say anything about the baby, on how gorgeous she heard she was or anything. She just basically called to down me. I cried but didnt tell her what i would have liked to, because shes my grandma and it would have been wrong i guess. But my boyfriend told me i should have said something to her. I just dont feel what was on my mind was appropriate to say to an nearly 80 y/o woman, whom i love so much. So my question is mylotters...Should i have told her how i feel?? Or did i do the right thing and hold it in?? Im wondering also because that day i went out n bought diet pills which are makin me have mood swings, and i hate them, but im a new mom i feel or shall i say FELT comfortable with myself, i enjoy playing with my daughter and spending time with my family. Well let me know! Thanks