Why does my bird do this everytime i go inside my room to say hi to her? or just to go in my room at all?

ive never hit my bird or anything like that, i spend alot of time with her, but everytime im walkin down the hallway to my room im like hi my baby girl Blossom, so she isnt scared, but once i walk in the room, she lifts her wings, like to stretch up, then puts them down, or she fluffs up her feathers and shakes like she is shaking off dust, then ill pick her up and she's cool with hanging out with me, but once i leave the room, she chirps until i come back, then she does the stretchy thing again or something. and she only does this with me, not anybody else, and idk if its a defense thing or a 'hello' type of thing?