It is always good to know your circumstances, since some of things we may suggest are costly. That is why I usually try to find a lower price, since many things do not have to be brand names. She is young to have a reproductive problem, but they can occur. First thing is to rule out her having a stuck egg. Some common reproductive disorders are salpingitis (inflammation of the oviduct,) coelomitis/egg yolk peritonitis, ascites or water belly from fluid, and cancer. All are more common in hens over 3, but not so much in pullets.