I am so happy for you, your family, and your beloved little mare,Kay...there is nothing more frightening than to have one with a colic that does not want to resolve! Heading to the University in a timely manner was the best decision you could make; a horse's chance of recovery should surgery be necessary is SO increased if the horse still has decent vital signs...
May God and the prayerful efforts of all who are 'pulling for' Tiny continue to have their positive effect---and of course, continue to guide the work of the talented and compassionate team of vets at the vet school!
FWIW--I raised a little horse who has now survived TWO colic surgeries! In both cases, it was indeed what he ingested-first, at @ 2 1/2 mos. of age, a combo of hair, dirt, and ?(it was after what happened with him that I began using a dose syringe to get psyllium into at least some of my foals, at a very young age!); I sold him at @ 2 1/2 years of age, with full disclosure of his history. His new owner(local) moved to a very sandy locale-and when he was around 7, he had a sand colic that again required surgery!!(They do now keep him on full matting-well, conveyor belting-and he is muzzled during arena(also sandy)turnout.) He is 12 years old this year, has won BEAUCOUPS show awards, especially at Pinto Nationals, for a number of years now! Adhesions following surgery-especially in the first year or so- are one of the major things to watch out for, according to my great 'in-town'(as opposed to my dear 'out here in the country') vets--Moon only had one episode, which the vet was able to 'talk me through' by phone. I am a firm believer in pure ALOE VERA juice after colic surgery; gave it to Moon for about two years after his. Nowadays, you can buy it by the gallon, and very reasonably-priced, at Wally World; back then, I had to go get it at the health food store.
Continued prayers and very positive thoughts from here for your dear Tiny....
Margo