No personal experience but I've read of it before and it does happen. I have read of folks finding it so bad they could not trust the girls to be alone so rather than one or the other spending a lot of time crated they did rehome one.
There is some solid research to show aggression is worse in spayed females but it seemed to be more human directed aggression and it seemed to have manifested before the spay as well. Here's a link to the study:
Good luck. Have you consulted with a trainer or behaviourist?