I took her outside and left them in a pen for a few hours earlier in the day, she ended up just sitting and glued to one spot the entire timeShe does sound like shes still in hatching mode doesn't she.. I wonder if possible, to have them in a slightly larger area where she'd be forced to get up and chase current chicks and show them food etc would help snap her out of it (I'm assuming you are keeping her contained in that crate).

However, when I move her chicks, she would try and follow.