I have a 5 month old German Shepherd that I rescued. She was super skinny when I got her and it was hard to get her to eat at first. When she first got here all she wanted to do was lay on the couch. I thought she was just scared and would come out of it. I have had her 3 weeks now and during the day she will not move from the couch. During the day all she does is lay there she will not go outside, eat, or play. At night however, she wants to play with me, eat and go outside. What is wrong?