The vet was here and gave the Ca IV using syringes, a total of 20 cc very slowly, monitoring her heart rate and stopping half way. You could actually see the thumps slow down and then stop. I just wish he had told us what it was he needed and spent all afternoon looking for (Calcium Gluconate) which we easily found in the Tractor Supply catalog for $5.99 a bottle. There are TWO TRS stores within 15 minutes of us.
You may notice a bandage on Bunny's left front leg now. While the vet we there we noticed her limping and that the leg is bowed, which it was NOT before. He assures us it is not joint ill, but applied the bandage and splint which we are to leave on for 10 hours and remove for 10 hrs for the next few days.
I do think the episodes today have been the final nail(s) in the coffin to our mini breeding adventure. I think (as soon as Sox foals, which I hope is soon) that we will throw in the towel. We will NOT however leave minis - the 4-H club is especially important to us, but we don't need to stress and expense of breeding to do that, or to show, or drive or enjoy our minis in lots of ways. Just not breeding.
ETA: The vet said to let the foal nurse.