Possible impacted crop question

[madhen]

I have a hen who recently started to lose weight. I feel a lump in her crop, and it appears to be firm, but made up of loose material (i.e, not a tumor). But I have also noticed, after isolating her, that food is passing through her undigested. She has been eating corn (fresh kernels) and soaked wheat berries, and I'm seeing whole kernels and berries in her feces.

Is undigested food common in impacted crop, or am I looking at something else?