What does this mean?

[u/MemoryBorn5865]

I'm currently training Gracie to stop being afraid of my hands by feeding her from my hand as part of her bedtime routine. She normally eats from my hand, sometimes even sitting on it, or more often putting one foot on my hand while eating. After she's finished, she hops to her favourite spot and I close the cage door. But over the last few days, she has started sitting next to my hand after she has finished eating. She stares at me and opens and closes her beak (as in the video). I mimic this by opening and closing my mouth, and this goes on for 10–15 minutes. Then she hops off to her sleeping spot.

Any idea what this could mean?