This was t the original article I read but it does talk about these behaviors and uses them as an example of a happy well adjusted parrot. I would also add that the blue Quaker probably was interested in you
“ While many well adjusted parrots will exhibit some or many of these behaviors, not all birds display all of the following activities.
Vocalization: Although a frustrated bird might scream, an unhappy bird or a bird that does not feel well won’t vocalize at all. Most avian vocalizations, whether singing, talking, or simply unintelligible chatter obviously indicate the feelings of well-being we humans associate with happiness.
Preening: A healthy parrot keeps its feathers in order, but a bird that does little except preening may be experiencing boredom or failure of independence.
Bathing: Most parrots relish showers or bathing in a bowl; many of them enjoy daily bathing. A bird that does not take an occasional head dip into a clean water bowl may not be feeling well.
Stretching: A happy, satisfied parrot will stretch in several different ways. The bird might raise both shoulders at the same time. Perhaps the wing and leg on the same side of the body will be stretched in unison followed in a short while with a stretch on the opposite side of the body in a mirror image.
Flapping: Many companion birds like to hold on tight to the cage or perch and flap their wings. This is not an unhappy bird behavior.
Tail Wagging: When a healthy, happy parrot is anticipating a different activity, it may wag its tail feathers vigorously. This behavior resembles a giggle in humans and may be done after a less than pleasant activity such as falling off the perch or toy during play. It indicates that the bird is ready to proceed to the next activity.
Beak Grinding: A sleepy parrot grinding the upper and lower beaks together with eyes closed or nearly closed is showing contentment. This is a self-comfort behavior and has no ill effects on parrots which may or may not have actual effect on the beak.
The word “happiness” may be somewhat “anthropomorphic” – a term applicable only to human behavior. However, animals, especially birds, are perfectly capable of communicating enjoyment of their own well-being. “
Article found on HARI “ Parrot Love: Reading Bird Body Language
Does a Parrot “Enjoy” Companion Life?”