That is exactly what ours looked like! I was so stressed ove it, but it turned out to be normal. Our 10 chickens are thriving, although they do tend to gang up on one another at times. They are about 10 months old now.
Glad to hear your flock is doing so well now. Hopefully it's just a case of 'ugly duck syndrome' & she'll grow into a fine looking hen... Cheers!