How old is she? If she is very young she may be missing the part where her doggie mom sets the boundaries and she has her puppy siblings to play with. You have not had her very long. Maybe she is missing her previous situation and just needs more time to settle in. Sounds like your other dogs are not being aggressive toward her, but sometimes puppies do play too rough, and they have those sharp little teeth. Does she cuddle with you at all.
Im sure others who breed and know a lot about young pups will come forth and give advise. Hang in!
__________________ .  Cali  , and Cali's keeper and staff, Jay No, not a "mini" Yorkie - She loves to motor in her Mini Cooper car |