Imara

Sleeping much more than her normal, staying fluffed up for long stretches rather than smoothing out, dozing on the cage floor or hunched in a corner, eyes half shut while she is supposed to be awake, and going off her toys. Length and posture, not the nap itself.

You have described a healthy nap almost item by item, and the foot is the detail that matters. Twenty minutes, on one foot, right after eating, then straight back to being a nuisance. That is a full crop and a relaxed bird.

Birds in the wild tend to be busy in the morning and late afternoon and rest through the middle, and a lot of parrots keep the shape in a living room. One foot plus smooth feathers afterwards is the thing to keep noticing.