The only odd thing about it was she dropped it by your driveway. Was there tall grass or bushes along your driveway that the fawn could hide in?? It is not unusal for them to drop them in hiway/road ditches but hen there is grass for the fawns to hide in. Generally the doe gives birth, lets the fawn nurse and then leaves it. It' s her way of not leaving a bunch of scent so predators can find the fawn or fawns. Until the fawn is old enough to go with her, they stay in the immediate area that they were born. Not right where they were dropped but very close to it. The doe only comes back to nurse the fawn/fawns. From what I have seen and understand, the doe will not go right to the fawn but stops a short distance away and calls the fawn. The fawn goes to the doe to nurse and then goes back to it' s hiding spot. Again so not to leave a lot of scent for predators. When we find fairly newborn twins, they generally aren' t laying together but a short distance apart. I figure it applies to predators also. If one is found, the other still has a chance to survive by not being found together. Always get a chuckle when you find/scare a doe nursing fairly newborn fawns. She takes off one way and each fawn takes off in another direction. Pretty clever to my thinking. Once the fawns are traveling with her, they all head in the same direction and this doesn' t appply then.
Interesting stuff!!

Tim