I don't think people understand the difference? A neuter is on males and testicals removed. A spay is on females and everything is removed also. They don't preform hysterectomy on dogs and leave anything behind.
Hello. I think contacting a Trainer is a great start. Putting a muzzle on her when outside with the other dogs and buying her a outdoor kennel pen might be needed. A Vet can do a blood panel and test for lots of things and possibly might find something that could be triggering her aggressive...