Did you put her on layer feed too early? It can really slow down the development rate if fed layer feed too soon.
My 2015 chicks started themselves on layer when they were about a month old. Ignored the chick feed in the brooder area and ate out of the community feeder.
7 girls, age at first egg:
EE: 23 weeks / 2 days
White Rock: 23/3
EE: 26/1
WR: 28/0
Black Australorp: 28/3
BA: 28/4
EE: 30/5
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