I have to agree with Dezines7. this could be a "false pregnancy" as it is not uncommon with that breed and at that age. She should get through this on her own her own but if not your veterinarian can help.
Hi!
Just reading your post. Could your dog be in heat or recently come out of one. Some dogs have a false pregnancy and she may think the toy is her baby. My sisters dog did that once and she was spayed...
Good luck!