OMG she is a doll.....and reminds me of my little Mia. Actually so much you posted reminds me of my Mia. I bought Mia when she was 7 months old and from a breeder, she weighed 2.7 pounds, now she weighs 3.2. I have no ill feelings about the breeder who had Mia but I have a feeling she was not attended to as she should have been as my Mia acted the SAME way you are describing yours is acting now. I have to say with a LOT of love and a little patience My Mia has turned out to be the most loving baby girl ever. She is however VERY partial to me as it sounds your Mia will be with you....after all she thinks you have rescued her I am sure and it appears you have.
Look how much our Mia's look alike.....it looks like we may have twins - hee, hee!!
