We have a first freshening two year old LaMancha doe that has Pregnancy Toxemia. She was overweight

The symptoms that she has: Sluggish, lost appetite, unsteady gait, weakness, stiffness, swollen legs, twitching, head-pressing, grunting, losing weight, laying down a lot.
We treated her around 6pm (it's 9:30 pm now) with 3 cc Vitamin B Complex, 50CC Calcium Gluconate, 50CC Magic (Corn syrup/Corn oil/Molasses). She did drink a little bit of warm water earlier.
She is due on March 5th, so we still have 14 days.
Can anyone tell me how to give the 50% Dextrose Solution?
We have called the vet but are still waiting for a call back...can anyone with experience help me out?
Thank you.