Rude people.

So my friend is pregnant. I'm super happy for her it's her rainbow baby and she's due in August. Her sister has been a complete you know what to me since I found out that I was pregnant. She messaged me on fb telling me I better not announce my pregnancy before her baby shower and not to brag about mine or even talk about it at her shower because it's her first baby and it's more special than mine because this is my second. So the other day, she posts a picture of her sister's baby bump and put #herpreggobellyiscuterthanyourpreggobelly 
I couldn't help but take offense to this because even if it's by chance not directed toward me, it's still very childish and very rude. It's actually bothered me so much that I don't even want to go to the shower on Saturday. I feel like she's trying to make me feel ashamed for being pregnant at the same time and even said "my best friend got pregnant right after I did and I know it was on purpose so she could steal attention from me and I hated her for it." That is not what I was doing. I hadn't been able to get pregnant since I had my daughter 7 years ago. My fiancé and I hadn't been avoiding it for 2 years so it could've happened at any time. I just really don't appreciate being treated this way and I can't say anything because she's one of those people that will laugh at you and be like well if you think it's about you.. 
Im trying to ignore her rudeness but it's difficult.