Amanda, I won't make any comments about whether or not there could be another fawn that is still alive other than to say I would doubt it. BUT I AM NOT A VET so PLEASE keep this in mind. I can only talk to what we have done here at our place, and the other day at a friends place I watched a vet in action with the same sort of issues.
Something in your wording has me wondering something. Both my wife and the vet reached into the doe all the way into the uterus. Which for both of these small women meant going in as far as their elbow. I am wonder how far you actually went into the doe? My guess, and it is only a guess, is that you may have only went a short ways and never reached the uterus. Maybe, again MAYBE, there is a fawn stuck in there beyond the area you felt?
DC, We had this several years ago and the doe was fine. She was a first time mother and the fawn was backwards.
Then we had a second doe 2 years ago. She had the feet sticking out but had given up pushing completely. After about 7 hours of the feet sticking out we took the fawns out for her. There was 2 fawns. Both came out not breathing or moving. I did CPR on both and got both of them going. But later that night they both died anyway. They were Soaring Eagle fawns. That mother has gone on the have fawns last spring and is set to fawn again any day now.
I have the most amazing wife. She is strong in heart and mind. I am very proud of how she was able to do what she did those 2 times.