Our little BO, Esther, looks & feels really thin. Her breast bone feels pointy & like there is no 'breast meat' on her chest. Her little wings tuck in very tight to her body giving her the look of having a 'waist'. Is this normal? She is 7-8 months old & is our best layer. I feed about 2 cups of layer crumble a day for our 3 girls (all 7-8 months). They free range at the very least for an hour a day right before sundown. Treats & table scraps 2-3 times a week. Are they fat enough? Should I worm them? I would like to keep the girls living as chemical free and medicine free as possible. Thank you.