Baby shower drama

In two months my step mom is throwing me a baby shower, I’m very thankful for her doing this for me; but in the same token, I don’t associate with ANYONE in my fathers side of the family & they’re the ones she’s inviting... idk if I should just smile and act happy when the time comes because I know for a fact I’ll never see any of them again and they will never see or be around my child or if I should keep stressing out about it or say something to her or what... idk I need advice so I can stop worrying!