Firstly, you need to stand her up and hold her up while she burps, pees and poos, then lay her down again somewhere clean, or change the straw under her. Stand her whenever you are passing, and hold her up for anything from 5 to 20 mins, depending on how much time you have.
For emergency energy, dissolve some glucose or dextrose powder in water (a heaped tablespoon in about 100mls plus a small pinch of salt) and give orally by syringe, or I have made a porridge with something such as ewe pencils or coarse mix soaked and even cooked, until it's broken down enough to be administered by syringe ( without a needle) orally. I use a 50ml syringe with a catheter tip (the long slightly tapered sort which comes with lamb feeding tubes) Squirt some gently into the back of her mouth, give her time to swallow (rub her throat until she does), then repeat until you can't get her to take any more. Repeat that as often as she will take some, as long as her rumen is working - if she smells acidic rather than the slightly sweet smell of normal sheep's breath, just give her liquid glucose - if you don't have the powder you could dissolve a bit from a licky bucket. Calciject works like a miracle to get a sheep back up, but then she needs sustenance to keep her going afterwards.
To get her to start eating again, small pieces of digestive biscuit pushed onto her tongue from the side of her mouth might interest her. She will not be able to produce milk for her lambs.
If you can get her back on her feet, have a good look at her teeth, back ones as well as front - if she doesn't have them all then that would explain the problem and she would not be suitable for breeding again - but she will survive quite happily for many years without the stress of lambing.