Worried about my Rhode Island Red
Hi! If you don't think she's old enough to be molting, she's likely not broody either. Has she been acting broody at all? Sometimes a hen will pick their own feathers for a nest. Lice or mites might be a cause. Do any of your other birds have any similar issues? here's a link to research that possibility.
Dust bathing in an irritant? Is there any redness? If you rule out a cause, some folks seem very pleased with feather fixer feeds to improve feathering. You could always post a picture as well. Best of luck!
They don't molt the first year, typically 16 mos give or take. She's not dust or mud bathing anywhere with an irritant? Nothing irritating in the nest box? Good quality feed...,If she's bright eyed and bushy tailed, I'd just keep an eye. Possibly someone else will have more suggestions. Keep us posted?