Baby shower

Trying not to seem rude or bitchy but my family is insane.. (We're gypsies) (I left my gypsy heritage behind when I married someone who was not a gypsy) well at my wedding me family (mainly my sister) brought people to my wedding that I had not invited actually people I had never met now for my baby shower she is bringing a group of people that I have never met.. I don't know how to tell her that I don't appreciate it and I don't want them coming.. Feeling very overwhelmed and nervous about how loud they will be..