She's lovely! ❤Yes by the way. She doesn't eat at night - none of my chickens eat at night (unless there is one who is sick and then I provide a light to keep it warm...low hanging light bulb (heat bulb).
Here are some pictures of my old girl. I included a side profile so you can see her crop bulge. It's bulging more now in the pictures because I let her eat some soaked layer crumble - about a 1/4 tsp at a time - 3 times today. She's been pooping a lot today. At least 10 times since this morning. And her poops were DRY. 3 or 4 would come out dry (a couple of them pretty good size for such a little chicken). Then another would come out looking wet - only to be followed by another much dryer poop.
In any case, all the poop has to be a good sign...I am now starting to think that her little intestines might have been blocked up...
I suggested overnight simply to see if it was emptying fully overnight. But if you don't give your flock access to food, then you don't need to worry about that step.
Let me change my question then: Have you checked her crop first thing in the morning, before letting her eat? That's a good way to know if it's blocked. But if she's pooping regularly, she's not (like you said).
It could be worms, then. Or a reproductive issue. Poor girl. I hope it's resolved soon.