I wish you the best of luck with this horse.
When our have an impaction colic, we (vet and I usually oil them and then walk them for 20-30 mins and wait to see what happens. If they want to lay down and not thrash, we will let them lay, if they want to thrash we will continue to walk them and on the rest breaks we leave them tied so they can not roll around. Do not give up hope yet, I know of a person who had their horse hauled to the vets office after it was diagnosed with impaction colic and it stayed there for 4 days and when they lead it from the barn to the office to have it put to sleep, it pooped right then. There is hope in these cases that they will come out of it. I know in this case they continually kept oiling the horse once or twice a day and walking it for about 30 minutes at a time 5 or 6 times aday since the owner could not afford the surgery and they believe that was what led to the final poop in the end.
You know how to make a miniature horse even smaller? Leave them in the dryer a little longer!
"Don't ever regret something that once made you smile"