Welcome to PetTalk Kristal.

I wonder why your Mum is so against having your cat spayed?
Who does the cat belong to you or your Mum? I feel there are issues here.
Having continuous pregnancies is doing Gabrielle no good whatsoever. If she's not spayed and you don't want any more kittens the price is - she has to be an indoor only cat. From the sound of it she's an indoor/outdoor cat and being kept inside is going to tick her off!
Maybe you could get your Mum to visit Pet Talk and see all these healthy, playful cats - she may change her mind. Good Luck.

Lynne