Inflamed vent and gooey poops?

[Babybunnies2000]

So this evening I was letting my house seramas wander around when I saw Stella poop something very liquid and gooey, almost the consistency of egg white. I don't think an egg exploded inside her or anything, I've seen no shell and there is only a slight bit of blood from a sore on the outside of her vent, which is swollen and looks very unhappy. She doesn't seem terribly ill, chipper, energetic, and independent as always, but I know I shouldn't ignore this. Please help? For now I'm just keeping her separated from her cage mate, Cookie. This won't make ever-anxious Cookie happy of course, but I can't have her pecking at Stella and risk her making it worse. I don't think it's prolapsed, but I'll send pictures in case somebody thinks otherwise.

 

[Babybunnies2000]

 

[Babybunnies2000]

I found an incredibly soft egg on the floor that she had likely laid a few minutes prior, which leads me to think her vent may be slightly prolapsed or otherwise strained from calcium deficiency. This was due to my own negligence, I should have had oyster shells available since they aren't eating calcium-rich feed. My plan is to wash her vent area and withhold food a bit to discourage her body from laying. And as I said earlier, keep her away from other birds until she's healed. Any further advice would be appreciated, as I'm sure there are things I don't know from my own research. I don't want to try to push the tissue back in unless I know it's out of place in the first place. The swelling has gone down significantly since I first noticed this, even since I took the pictures half an hour ago. You don't see any red shiny flesh anymore, just the normal paler wrinkly skin of a chicken's vent. It's still inflamed and weird looking, but I think she'll probably recover just fine. We'll see how she is in the morning.
Oh boy did I learn a lesson from this: make sure your hens have enough calcium. This honestly scared the crap out of me.

 

[Babybunnies2000]

Stella looks normal this morning, and except for a slight bit of blood in her poop she seems to be recovered. I do believe that I learned a very important lesson, though.