Who Throws The Shower

I have a very close cousin. I have bben asked to be in her wedding, along with 7 other bridesmaids. Her sister is throwing her a "bridal party and friends" shower . My mom and sister are hurt that they were not invited to any shower. We have a medium size family. My other Aunts and cousins didn`t get invited to a shower. I ask my cousin Dori (the bride) what is going on ...she said no one in the family is throwing her a shower. I think it should have been her sisters place to include the family in her shower .I don`t know what to do but I feel because we are so closethat maybe I should throw her another shower for the family,which would make it her 5th shower. I really need to get moving on this if I am to do it because I live 3 hrs away from all of them.I don`t want Dori`s feelings hurt and will throw her one if no one else will but it will have to be a suprise because of the terrible planning. Her wedding is Oct 11.I would appreciate an answer as soon as possible please.Thank you so much..