Holly can be like this. We generally clean her feet in my room, so its quiet, just me and her so she will take the treats.
She used to only eat them if I left them in her cage.
Then I started offering her treats when she was in her cage, and she did start taking them. Now she'll take them if its just me and her in my room.
She loves plain cooked duck the most !! She'll take that no problem wherever she is !!