Teasing about my pregnancy weight!!!?

i used to weigh 120 pounds.now iam 145 pounds coz iam pregnant.this particular neighbour always used to comment on my weight and say"oh !u have put on weight!"(when i was just 120 lbs).now she is all the time commenting very rudely about my weight.i know it's just pregnancy weight and it's my baby growing but when someone constantly comments about it very rudely u feel frustrated.i have tried snubbing her and ignoring her.nothing seems to work.what should i do?