Sour crop? 1st time chicken mom! Help!

[TexMum]

Tonight I noticed one of my hens (13 weeks) wasn’t acting herself. I went out to give them some watermelon and she was willing to come and be curious but never actually went for the watermelon. They’ve been free ranging and are free fed (Nutrena Starter/Grower). I grabbed her (which she also never lets me willingly do lol) and she immediately had some watery greenish foul liquid coming out of her mouth. I then noticed her jiggly bulge in her crop and massaged and more of that liquid coming up, so I immediately turned her upside down so she wouldn’t aspirate. I continued to massage and she seemed to then perk up some, with her comb starting to redden up some too. I haven’t noticed a hard lump so I think it may just be sour crop but the bulge never did actually go away. The pictures attached is her after massaging for a good 10-15 minutes. She just wanted to lay down. I did read the article on here so I’ve separated her in the kennel in the coop to observe overnight and start monistat tomorrow.
Should I also do the coconut oil first if I’m not sure it’s impacted?
Also, it’s a horrible heat wave week this week in Texas (triple digits), should I bring her inside?
She’s our only barred rock girl now and a favorite so we’re hoping to get her through this. Is there anything we can do to prevent it from happening to the other girls or her again? Will this be a constant problem from now on for her?
Any and all info is appreciated!

 

[Wyorp Rock]

I leave my birds with their flock unless they are being picked on and just take them aside for a few minutes to administer treatment.

Re-check her crop first thing in the morning to see if it's emptied. Get some photos of her poop.
If the crop has not emptied, then begin treating according to the article below. When I treat a crop, I always give coconut oil in addition to anything else I deem necessary according to the article.

Do you provide grit (crushed granite) for your flock?


https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/

 

[TexMum]

Her crop is definitely smaller than it was last night but she still has a small balloon like feeling lump. Her stool is loose and dark/black. I let her out with the others and she is just laying around and the others are starting to peck at her and the cockerel is trying to mount her (both she doesn’t like), so I will keep her separated.
I haven’t been giving grit mainly bc I wasn’t sure when to. I will start that today as well.
Should I bring her inside while treating with how bad the heat is here in Texas?

 

[TexMum]

Her crop is definitely smaller than it was last night but she still has a small balloon like feeling lump. Her stool is loose and dark/black. I let her out with the others and she is just laying around and the others are starting to peck at her and the cockerel is trying to mount her (both she doesn’t like), so I will keep her separated.
I haven’t been giving grit mainly bc I wasn’t sure when to. I will start that today as well.
Should I bring her inside while treating with how bad the heat is here in Texas?

I picked her up to move her back into a kennel and she started to do this. Close her eyes and lay her head back. Then when I placed her in the kennel, the greenish watery liquid came pooling from her mouth. I messaged then immediately pulled her back up and she just kept vomiting up the liquid and was so weak she couldn’t hold her head up. She started to flail then just laid over stretching. She just passed

 

[Wyorp Rock]

I'm sorry about your pullet.

The poop photos almost looks like there was some blood?
I'd keep watch on the other's poop just to be sure there's not something going on.