Congratulations! The first thing I would do is have her thoroughly checked by your vet and find out if he/she has any recommendations. If it is just depression and being a "couch potato", I would find out what she would absolutely love as a little treat. We found that our Toto's weakness is Honeycomb cereal and used teeny little pieces of that. We have had her since she was sixteen weeks and I found that if I just waited until she did something good and praised her, she was eager to please [the little pieces of cereal as a reward did wonders especially with the pad training]. Good luck with your Yorkie baby!!