family probs

so quick vent, I had my son 10 months ago. I lost my job shortly after and my SO let me stay home to be just a mom. Problem is, I haven't lost the baby weight, in fact I've gain a little more. Every time I see my mother she asks if I'm pregnant again because of how I carry the weight. Then proceeds to call me fat every. single. time. It's getting to the point where I want absolutely no contact with her. It's not like I'm not trying to lose the weight, I am. what should I do?