I totally get you, being snowed in during lambing is not fun!
The Stories Guide to Raising Sheep gives a lamb formula for bummer lambs: For approximately one days milk supply, mix 26 ounces of milk (mix half evaporated milk with half water), 1Tbs caster oil (or cod-liver oil), 1Tbs glucose or sugar, and 1 beaten egg yolk.
1. Mix well, then give about 2 ounces at a time the first day, allowing 2 to 3 hours between feeding. Use a lamb bottle; in a pinch, a baby bottle will work (enlarge the nipple hole by making a small x opening with a knife). When the lamb is a few days older, lamb nipples, which are larger, should be used.
2. On the second day, increase the feedings of the formula to 3 ounces at a time (or 4 ounces for a large, hungry lamb) 2 to 3 hours apart.
3. On the third day, the formula can be made without the egg yolks and sugar, and the oil can be reduced to 1tsp per 26 ounces of milk.
4. After the third day, you can gradually change to lamb milk replacer. Do not use milk replacer that is formulated for calves; it is too low in fat and protein. Your local feed store or veterinarian can special order lamb milk replacer if it's not in stock. Goat's milk is also a good lamb food, so if you have it on hand, you won't need powdered milk replacer.
I don't know the situation with your ewe, but it would be a good idea to try to milk her out. She will naturally reabsorb the milk, but for future preparedness it would be a good idea to have actual sheep colostrum saved in the freezer. An ewe naturally produces the correct "formula," so if you milk her throughout her lactation, you will collect the needed milk and colostrum to supplement other lambs. Sheep milk freezes pretty well, so you can just put it in a labeled container in the freezer just in case.
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