She is a 8 1/2 month old SLW who started limping a few days ago. She limps about, fibds a spot to peck at & lays down to peck instead of scratching. She is still laying, eating and drinking. Checked her all over, no apparent injury or any other symptoms. Thought maybe the coop roost that is 2x2 with rounded edges was to narrow to support her weight as she is our biggest bird. Promptly added a 2x4 roost with wide side flat. So change. In fact she's getting worse. This morning she is waddling more than limping and her fluffy bottom is nearly dragging the ground! She went away from other birds and laid down. Poor thing tried scratching her head and couldn't support her weight on one leg. We are brand new to keeping chickens, like July this year new, and would hate to lose such a lovely bird so early on. Any suggestions??