If she isn't interested in food at all, then you can feed her via a big syringe (the type used with a lamb feeding tube, but without the tube and without a needle). I have tried various brews, such as digestives or oatcakes soaked in water, and porage made from sheep coarse mix, with added glucose powder. Gently squeeze a small amount at a time towards the back of her mouth, on top of her tongue, and wait until she swallows before repeating. You can usually get about 50mls down in a session - repeat as often as you have time for. Even lukewarm water with glucose and a pinch of salt will help keep her hydrated until she feels more like eating.
If she isn't standing, then make sure you stand her every couple of hours so she can burp, pee and poop, and her legs don't go numb (lift the back end, then the front, being careful obviously not to pull on the lamb bump) and hold her up or prop her with bales.