Yes, I've been experimenting with that! I thought the layer feed might not be enough of the right things for chicks, and our feed store only carried the medicated chick feed, which I didn't want, so I've been trying to offer a variety of other human foods to complement the mash. I've offered boiled lentils, scrambled eggs, grated cheese, grated apple, canned salmon, crumbled biscuits, and any other "plain" food that seems potentially palatable. Each of these has been preferred at some point, and disdained at another time. I suppose she is carefully monitoring their diet and knows what they need.This is good to read. By this foraging she has got their GITs off to a great start.
If you want to try another experiment, see if she still prioritizes forage if you offer some real food, instead of whatever 'moist feed' you have been giving them so far. It need not be meat, fish, or dairy, but I would expect any of them to be preferred.
When she wants something particular she cannot find and I haven't offered, she gets very insistent--flapping and pecking at my pants and giving me a hard stare. I try to remember what she's had recently and offer what I think she might be missing. If I guess right, she makes vigorous "hungry grunts" as she eats (more than the chucks that she uses to guide the chicks). If I guess wrong, she nibbles a bit and then goes back to foraging.