My Sweetie used to kick the big hard pellets from this food I gave him and talk to the empty corner. He liked kicking things out.
You have gotten a lot of good suggestions. I think she might be nesting or she might just like sitting in the dish. My Sweetie is a boy and when he was a baby he used to sit in the soft seed and rest.
You could reduce the size of the seed cup and buy a couple more and put them around the cage in various places. They would still have their food but it wouldn't make such a comfy nest.