I would treat her for Milk fever and ketosis.
She can be drenched with a mixture of Mollassews, corn oil, and corn syrup, 8 to 10 ounces a couple times a day.
given Nutridrench
Or given propalyne glycol(several ounces a day)
I would also get calcium into her, by either getting the calcium Gluconate 23% IV fluid and injecting it Sub-q, 15 cc per location and 45 cc at a time a couple times the first day.
or oral Calcium (CMPK) for lactating animals and drench her with it.
Force her to stand and walk.
Put a salt lick block, next to her water and put some mollasses in her water.
offer her alfalfa hay or leaves from branches for calories.
I would also consider the condition of her hooves, when was the last time they were trimmed? Some people don't like trimming a pregnant goats feet, so that could also be an issue.
If you haven't trimmed them in the past 4 to 6 weeks, I would trim them and put a hoof medicine on them such as koppertox or hoof n heal.