Hi. Sorry for your losses.
I assume you've tried each of the other 9? What about several at a time?
I wish I had an easy answer. We've been through some terrible looking skirmishes, first with Prissy and everyone else, then with Lola and Rosa, who were introduced a couple years after the last group. Only Pandora accepted them both right off. Both had been single ferrets, but Lola tried so hard to make friends, it was really sad watching her get beat up. Rosa, on the other hand, didn't know how to play with others and always ended up biting someone. It took a couple months for them to sort it themselves. Prissy only really mellowed after she lost her sight (we suspect a stroke). Even now, we've only found her sleeping with Yoshi, one time, when he got into her gated area and crawled into her bed while she was asleep.
Try putting a couple bowls of food near each other and see if she can at least eat in the presence of another ferret. You can also try swapping bedding with the others to get her used to their smell.
Wish you the best of luck
<message edited by unclejoe on Monday, May 25, 2015 5:55 PM>