That sheds A LOT of light on the situation. Spunky is used to being the Queen of the house, and it trying to establish the rules. My situation is similar - Ally was an only cat and a spoiled little madam for over two years, and she is very aggresive with Connor.

I don't really know what to suggest - if it was just introducing one cat to another, there is plenty of advice regarding the process of introducing them. In some cases, such as mine, it helped a bit to separate them and then re-intorduce them after a break.

Does Spunky have a special place that she can go, to get away from the others? I have also found that Ally really enjoys having some "special time" with me, without having to share with Connor. Is there any way you could isolate Spunky for short periods, give her a treat and some quality time, so she knows she is still loved?

Sorry I am not able to give you further info - I am battling with the same problem myself. Maybe some of the others can give you further advice?

Some members have had success with Feliway plug-ins or spray, or putting some Rescue Remedy in the drinking water - maybe you could try this - it seems to generate a more calm environment.

Good luck, and don't forget to let us know how things are progressing.