If the ewe isn't up after you pull the lamb, but flat out and not interested in anything, then she is bad off...call the vet. A ewe can take a lot of abuse on lambing so to have one, flat out, means she is not well.....if you just pulled the lamb and she is exhausted, that maybe different but what I am reading is the lamb was pulled out a bit ago, she reeks and motionless....dead lamb means she maybe torn up inside, infected, etc. any number of things.......the Vet is the best call.
I had to pull a dead lamb once, it came out in pieces and reeked so bad that I threw up from the smell....the ewe after I pulled the lambed, hopped up and started calling for her baby. I grabbed a bottle baby, slathered some of the dead lamb and liquid on it, and she took it ...sorta, she expected her lamb to be laying down so she could lick it but this lamb was up and crying and running around...you could see the look of puzzlement. she searched the stall very thoroughly and even under the feeder and then concluded that lamb was hers....then turned into a raging bitch when she suddenly saw Tess (who had been in the stall all the time and she had ignored her)...pumped her full of antibiotics and she was fine.....after I had pulled the lamb, after a long labor, I was sure she would not be able to get up. I had to work to get the lamb out and she was wore out.
The next yr and yrs after, she never had any issues and twinned. I was amazed she was able to get up after the long labor and dead lamb but she was raring to go. after the lamb was weaned and brought back into the flock, he towered over her and she still paid attention to him (not nursing but called with the soft mama call)....for some reason she was especially attached to him.