You didn't mention if you reintroduced her into the household? Acting as if she's a completely new cat is definitely the way to go. Doing towel-scent exchanges, vanilla, feliway etc.
How many litter boxes do you have? Where are they located?
How many hide-outs, trees, windows ledges?
Do they go outside or are they only inside?
You may want to prevent the calico from looking out windows, just in case she's redirecting aggression or frustration. If they go outside then prevent them from doing so. The different smells can ruin all of your introduction efforts.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.