Clear liquid

[Wyorp Rock]

I have a broody hen who is currently attempting to hatch a clutch of eggs... A few minutes ago I went to check on her/ the eggs/ etc. I pushed up from under her slightly to see if the eggs were starting to hatch as it's getting pretty close... And then she leaned over and spit this goopy clear liquid out... At first I thought she at an egg, not going to lie.. but after seeing the eggs were fine I googled it. It says to just make sure she's eating and drinking but she's broody so she already doesn't really do that.... Did she do this to herself by being broody too long? Also, what's happening? I'm new at chicken owning and have only had them for about two years and this has never happened. I don't think the other two chickens are doing this but I'm not sure how to be sure. Thanks for the help!

How long has she been brooding?
When are the chicks due to hatch? How many days?

Sounds like she may have a crop that's not emptying, but it could be that she drank a lot of water.