Are dry pellets her main diet? If you have time time I would mix it up. My mareks bird always gets a wet mixture of different things with a base of chicken feed.
She eats best first thing in the morning and it is always a mushy mixture of feed, egg, with rice or liver or something thrown in. I work from home so I a have the time to check on her, during the day I throw in extra stuff, when she is in the yard she eats best when I throw food on the ground for her (corn, or soft chicken feed).
Basically she likes variety (and is no doubt spoiled and expects me to bring something new 3 times a day so she is picky).
Seems to me eating is often a "social" thing for chickens just like people, if you watch the flock they often all graze at the same time, or most start to eat at the same time etc... I think a lone bird that doesn't have that social setting to instigate eating may be part of the problem in some cases.