It actually does, and it is an observational fact. Whoever told you that feeding layer feed to baby/young/male/nonlaying birds clearly didn't any experience or knowledge in the area.
Layer feed has too little protein for growing birds, resulting in stunted birds. (With nutrition deficiency, like...
How long has she been on the layer? While she is growing/not laying, she needs grower feed. Layer feed isn't great for young/male or nonlaying birds.
She needs more nutrition.
Get her grower feed and then get some 400i.u vitamin E capsule and b complex tablet from the grocery store, give her...