Ok, please tell me how to make it or where I can find instructions on making it!

She finally ate millet off the stick (and from my hand) today when I opened the doors of her cage. after I put her cage back up on the dresser, she climbed up onto her swing perch where she sleeps, so I turned the lights off... and then she started making a clicking sound with her beak? I've read that this is a sign of a content and happy budgie, but I've also read it's from stress- do you know which it is?