She is so cute! Congratulations! You are going to have so much fun with her, dressing her up and such. The shaking may be that she is cold if you have air conditioning, if not then it can be that she is dreaming or has low blood sugar as I know its very hot now in
PR. Maybe just get her a little sweater or blanket if you have air conditioning and get nutrical since she is so young. I know that it is common to sell puppies early in
PR, there are sooo many stray dogs. Everytime i go i always see ppl selling them on the roadsides and streets. At least she is in good hands with you.