Ugh that sucks :-( Did you try reintroducing them reeeeealllly slowly?
Cats are *special* creatures aren't they?
ETA: I read your blog post about Monkey, and it sounds awful. I agree with you that her quality of life does not sound the best right now. Is it in your power to consider consulting with a veterinary behaviorist? If you talk with your regular vet, there might be one in your area he/she can refer you to.
I watched the videos you posted and it looks like Monkey has some pretty severe anxiety (I am not a vet yet, this is just my personal opinion, obvs). There are prescription medications that can help reduce anxiety while you work on a plan to help Monkey come to terms with her new situation. There are also medications that can increase her confidence if she is being bullied. I know it sounds nuts but just an option if you haven't thought about it. Sometimes extreme environment changes like the one Monkey experienced can cause that kind of generalized anxiety.
Either way, I really hope that things work out. Monkey seems like a great cat, poor thing - I wish there was something I could do to help. Best of luck!