Best Friend Jealous of Pregnancy

Anyone else experiencing a jealous female friend or relative when it comes to their pregnancy? My cousin is my best friend, but ever since I got pregnant she has made constant snide remarks about anything she can. She never asks about the baby, seems disinterested in the entire thing (when I know she loves babies and wants one as soon as she can). She cuts me down about things like my car, the fact that it's a boy and not a girl, my weight / how big my bump is, etc. I've been trying to ignore it, but it's really getting to me and I feel like I'm going to go off on her if it continues. I just hate having a conflict when I'm pregnant. 
Anyone else? Any tips for how to deal with her without completely losing the friendship?