You'll want to take a look at the skin on her back... under her quills to check for dry skin. To see, you'll pet her "backwards." Go from tail end toward her head, gently lifting the quils so that you can see down to her skin. If it looks white and flakey, that's dry skin. It's pretty bad dry skin if she leaves flakes behind when you pick her up, play with her, etc...
I am so glad you got her off the pine!