Two of my girls hatched at the end of Feb./beginning of March are molting while one has not. I'd always read that chickens would not molt their first year, and that was true of my original flock (although they'd been summer hatchlings). So it's certainly possible (and likely) that your girl is just molting.
eta - just took a closer look at your girl (didn't realize I could make your pic larger). She's def. molting.
I would also agree she is molting, our girls are also 9 months and several went into molt over the past few weeks and one looks similar to yours, no neck feathers and just plain scraggly in other places. I tend to believe is has to do with climate also, but not 100% just an opinion from our flock this year.