Worried Chin Mama

I have a girl chinchilla thats about 1 1/2 years old and recently she's been wedging herself in the back corner of her cage and almost getting stuck, barking a lot more and recently I found something that looks just like blood in her cage. Her feet are fine and she still eats, drinks, plays with toys etc, but I'm worried about this sudden behavior. Could something be wrong?

Thanks!