I'm so glad to hear that she was already spayed and in good health. I'm also glad that the introductions have been going well too. Maybe some of your cats are now getting used to new arrivals in your home so it's not such a big deal any more like it was at first. I know that my Storm has seen so many cats come and go that it's not as big of a deal for a newbie to be brought into my home any more. My females still don't like Alani & Blaze though and I've had them since they were about 10 weeks old. They'll soon be 2 years old. If one of them even looks at Ziggy from across the room, she'll growl and hiss. My four boys get along very well. My bedroom has become a cat sanctuary for my four older cats because Alani & Blaze aren't allowed in there. I've always found the females are more difficult when it comes to new introductions and they're also more territorial. It seems like males can live in multi-cat households much easier than females at least this is the case in my home. Good luck.