All chickens molt. It's a necessary part of their biology. Most shed a feather here, a feather there, for about 2 months. Not Penny. She loses all the feathers she's going to lose in a matter of 3 days. She has one more day to go.
She'll be in this state for about 6 weeks. I worry every year that she won't grow her feathers back by the first frost. She always makes it in, just under the wire. Luckily, she has the other chickens to snuggle up with when she gets a little chilly at night.