I have a silky female RN dove who is very inactive. She will not get off of her perch or go to the bottom of her cage. When she is out she will only stand in one place and walks stiffly when she takes a step. She is eating and her droppings are normal. She has gone out of her cage with another female and by herself and she does the same thing - no movement. She will not respond to the male nearby her cage. Is there something wrong with her? I have two other silkies who are very active, so I know that it is not the silky type dove.