That's 100% what they eat. Sounds like she is feeding them grass and standard bird seed or super cheap chicken feed. My BIL keeps chickens and he had to experiment with like a dozen combinations of feeding techniques to get eggs (and chicken meat since some of his chickens are for meat) that he thought tastes good. IIRC at the beginning he fed them just whatever they foraged and supplemented with regular bird seed or cheap chicken feed and he hated it.
Are you some kind of ****ing chicken whisperer? Got a special technique for talking to the chickens? ****ing hell.