Baby shower for second children?

I am expecting my second child. We are expecting a girl, and already have a beautiful daughter who is three. My mother is very excited to throw us another baby shower, but I'm not sure that is appropriate. We have most of the things big we need. This baby will be born in a different season so clothing, and things like diapers, wipes, and bottles would be helpful. Does it seem greedy to have another shower or is that socially acceptable?