Seems odd that she'd wander too far away from her newborn kids. Search for her body.
They will NOT eat from a bowl. You will need to go to the farm store and get lamb nipples that fit on a pop bottle. Feed WHOLE VIT D COWS MILK FROM THE GROCERY STORE. No formula - you'll end up with issues. You will need to feed at least 3x per day, as much as they want, up to about 20oz.
Start offering hay and lamb starter free choice at about 2 weeks of age, along with loose minerals and baking soda. KEEP FEEDING milk.
coccidia prevention at 3, 6, 9, 12, 15, 18, 21 wks old. Longer if needed. I deworm at 4 and 8 weeks of age, then again as needed. I also vaccinate for CDT at 4 and 8 weeks of age.
Kids can be weaned as early as 8 wks if eating solids well - I free choice grain/hay. The trick is never letting them run out such that when you DO fill the feeder, they gorge themselves - this can cause problems. I suggest a lamb starter which is usually medicated and the Ca:P is balanced for the wethers/bucklings. I usually do not wean doe kids till 3-4 months of age, sometimes as late as 5. They grow fast this way.

WE usually get down to 2x per day feedings by around 3 mon.