I have a 4 week old Americauna chick. Her bottom beak hasn't grown. Her upper beak is very large, like a parrot. She was okay until last week and is now having a hard time eating and isn't growing or as active as the other chicks. I've filed down her beak a little but I am not sure if I can take any more off of it...I don't want to cause pain or hit her nerve in her beak. Has anyone had experience with this?