Hateful cousin

What should I do about this. My cousin found out I’m ttc (it’s not a secret but not out in the open, and none of her business because we don’t talk) and all she has to say is that I don’t deserve a child and that god doesn’t think so either since I’ve been trying for 7 months and no luck. She also is saying it’s because I’m fat that I can’t get pregnant. (I’m about 10-15lbs overweight)