Oh you poor chook. I would get your mum to help you organise your baby shower. That way your friend is out of the loop iykwim. I was kind of in the same boat however my dh's Aunty and his mum are organising mine which is good because I trust them to throw a great time. They also organised my pre wedding showers and egagement party etc.
I really don't agree with SHARING these types of things as they are supposed to be for YOU and YOUR BABY. Its up to you if you invite both male and female friends and family to come. I actually wanted to do the same thing but that one has been thrown out the window as dh doesn't want to do it that way(he's a traditionalist).
I wish you all the best in whatever you decide to do hun.