Oh Debbie, you're an angel for trying to help this cat. I really hope they'll let you keep her in your office for a while, until a solution is found. If not, any chance she could stay a little while in your garage?

I hope the family who is dumping this cat, is not considering getting another!! If so, could you contact the right authorities and tell them the story, so that they won't be allowed? In fact, what they are about to do now, should be reported!!

I agree that dumping her in the outside would be too cruel, especially when she has lived an inside life all the time. So if you really HAVE to decide at a point, I'd say the best for her would be to have her put to sleep - but very, very sad!!