The longer you "wait and see", the more in peril your ewe will get. Doing nothing will insure the death of all of them. Have you taken any action for her?
If she survives, I recommend you read below.
Nutrition as Prevention
One major factor in the nutrition of the pregnant ewe/doe is that of the unborn lamb/kid. The gestation period in sheep/goats is short as compared to many other animals and the fetal demand for nutrients and glucose is at its greatest during the last two months of pregnancy. In fact, about 80 percent of the growth of the fetus occurs during the last six weeks of pregnancy; if twins are present, the increase in total weight is considerable.
Although much is yet to be learned about pregnancy toxemia, the incident of the disease can be minimized by careful management and proper nutrition. The total metabolic rate increases by at least 50 percent during late pregnancy. It has been shown that late-pregnant ewes/goats require about 50 percent more feed if bearing a single lamb and about 75 percent if carrying twins. The increased amount of feed, however, sometimes exceeds the sheep’s digestive capacity unless grain is substituted for part of the hay. Multiple fetuses will tend to crowd the animals digestive system therefore limiting intake, this is where concentrates can help.
One pound of corn or the equivalent of high energy concentrate should be fed daily during the last six weeks of pregnancy.
Affected ewes stand apart from others in the flock, walk unsteadily, appear dull, and are usually off feed. Vision may be impaired, and they show little fear of humans or dogs. Blindness often results, and eventually there can be convulsions, grinding of the teeth, labored respiration and usually a mucous discharge from the nose. The mortality rate is about 80 percent, with death usually occurring in from two to 10 days. A shock-like state eventually occurs.
Pregnant ewes/goats should be in medium condition and not fat; body condition 3.5. During the first half of pregnancy, excessive fat should be reduced and weight gains should be allowed only during the six weeks before lambing/kidding. Overly fat ewes/does seem more susceptible to the stress syndrome of pregnancy toxemia than are other ewes/does. Late-pregnant ewes/does should be treated with considerable care at all times to minimize both physical and psychological stresses. Feed should never be withheld and transportation avoided if possible.
Treatment of pregnancy toxemia in ewes/does other than feeding concentrates might include; oral propylene glycol or corn syrup are quick sources of energy and should be given at the rate of 200 ml four-times daily along with 3 to 4 liters of an electrolyte solution designed for dehydration in livestock.