Not quite a yawn?

[Scareab]

Hello!
I have a silver laced wyandotte almost 3 weeks, and she does this weird thing I can’t wrap my head around.
It’s almost like she’s yawning, but it’s more of the action. Opening the mouth wide and elongating her neck out in the action of a yawn. It comes in multiples of at least threes or so. I know it’s not yawning because it’s a little different. It’s been happening for a couple days now.
I’m not sure if I should be worried or not. My previous chicks have never done this before so I’m pretty concerned. I’ve attached pics of my chick but couldn’t get a video of it.
Anyone know what this is?

 

[Eggcessive]

It sounds like she may be adjusting her crop. Does her crop feel full and hard? Is she drinking well? Do you have any chick grit for them to take when eating grasses and other food? This video shows an adult chicken adjusting their crop: