What a horrid experience for you.
If you have the time to support an adoption then she probably will take another lamb if you can get one within a couple of days. Skinning the dead lamb and putting its jacket on the adoptee will help but a bereaved ewe will usually eventually take an adoptee - sometimes it takes a week but they usually come round once the lamb's poo smells of the ewe's milk. Keep them penned together and support the lamb to feed until no longer needed - or use an adopter, they do seem to work though I've never used one myself.
Irish Shepherd, I'm not sure about using Dettol - the ewe will lick the lamb and isn't Dettol somewhat toxic if ingested?
Joanne, in case you have a similar situation again:
You should be able to get the ewe to follow the lamb even if the lamb won't bleat. Hold the lamb near to the ground and move slowly, keeping the lamb just in front of the ewe so she can see and smell it. Make bleating sounds yourself - each shepherd has his/her own lamb noise, mine is a 'meep meep', you'll refine it as you use it and see what seems to work. Be prepared to go back to the ewe and put the lamb in front of her nose time and time again if necessary - move slowly in small stages, if she keeps breaking back then put the lamb on the ground and let her have time with it, lick it and smell it, before moving it again.
If you still can't get her to follow the lamb then, if the lamb can walk, you can drive the ewe and lamb to where you want them. If the lamb can't walk you'll need an accomplice; one of you carries the lamb alongside the ewe and the other drives from behind. Otherwise catch her and, if you don't have a trailer, manhandle her to where you need her so you can pen her with her lamb. Otherwise make a pen around her and the lamb in the field.