My vet did mention that drastic weather changes can result in colic. I live in Missouri and the weather has been stupid the past two weeks. One day it was 75 degrees, and 2 days later is was 20 degrees and snowing. It's been going back and forth between 20-30 degree highs, and 60-70 degree highs within a week's time. She said she'll likely have a few more colic cases because they tend to happen in clusters when the weather is strange.
After assessing the vitals and symptoms, she told me that it was probably either cyathostomes or sand. I gave the quest which would treat the cyathostomes, and then did the "sand test" where I put 4 fecal balls in a bag and filled with water with one corner down. She said if there is sand in the corner after all the poo dissolved, then I should treat with psyllium.
My poo bag has so far only collected hay fibers in the corner, and the vet said she's probably fine on the sand thing. I'm wondering if giving her a little psyllium wouldn't hurt though? I feel like if there's a significant amount of food fibers in the poo, then maybe she isn't digesting things properly. Although, to be honest I've never inspected horse poo, so I wouldn't know how common fibrous stuff is in manure.
Lakota is also weird about her water, so I've been adding electrolytes to her grain in the evening so hopefully she'll drink more water. Also giving fastrack to help populate the good stuff in her gut.
The vet said that for a week after the quest is given, the cyathostomes will be dying off and coming out of the intestinal wall to be passed out, and that horses can seem "off" during that time period. She just said to keep a close eye on her and give banamine if she's clearly uncomfortable and not eating any food for the next week, and then to call her and see where we need to go from there.
Hopefully things will get better in the next week. I'll probably order some Equi Aid (thanks for the link)
Thank you guys!