Interesting. Well, unless you can re introduce them and get Boo Boo to calm down around her, ONE of them is always going to have to be separate.

I think you can work towards that goal, using a water squirt bottle and keeping Boo Boo on the leash for a few days. At least you should have an idea if there is any improvement.

Poor Tiggy! Catty1's Oscar is easily upset also. She made some fabric collars to put around his neck - they just slip over his cat collar. She sprays the fabric collar with Feliway and that seems to keep Oscr calm and happy!

I wish you success in getting to a calmer household!