Liquid coming out of my hen's beak??

[KittyKat7]

When my dad picked up one of our chickens earlier today, a bunch of clear liquid poured out of her beak. It seemed to be odorless, and had a slight yellowish tint. It happened again a few hours later to me, although not as much, and just recently happened again, for the third time, when my mother picked her up. The liquid is much more than a beakful, so it isn't just water coming out of her beak after drinking. We let our chickens roam outside of the coop in the backyard during the day, and for the three or four hours that they have been out, this hen has been standing in the grass, not doing anything, away from the other birds. She normally is a fairly nervous bird, and usually runs away when we try to pick her up, but today she has had no reaction and we are able to pick her up, pet her, and carry her without a problem. We just noticed this today, and yesterday she seemed to be laying normally. She looks normal, except for fluffing up, and walks normal. It isn't a cold day, it's around 70 degrees F, so I can't think of why she'd be fluffed up the way she is. Does anyone know what is wrong with her? Also, should we be separating her from the other chickens?

 

[KittyKat7]

Also, she hasn't seemed to be eating or drinking. I haven't noticed her pooping or urinating at all.

 

[aart]

Check her crop?
It should be full when she goes to roost at might and then empty first thing in the morning.
If not, search sour crop.
Advanced search>titles only> sour crop.