Sounds like things are going REALLY GOOD with Polly!!! But remember it's only been over a week or so since you brought her home...some yorkies it just takes a little bit more time to start liking each other!!
Daizy is more timid and Tulip is my second...she was a wild child...so it did take a couple weeks for them to start playing with each other...and little more for them to start sleeping together!
Jess will come around too....the fact that they are eating together is good....
It's precious to hear that she's playing with her little toys too!!! tearing up her pup's...hehe (loved your comment about her own pups...teehee)
It's so sad to think of where she came....but try not to do that...and be firm when she needs it....loving when she allows it...and you'll both be very happy with this relationship!!
Sounds like you're doing everything right!!!! Thanks so much for updating us...please keep it up!!!