Thinking the same. I also believe she is very oldLooks like a fawn that hasn't/can't be born. Something tells me this outcome won't be good for the doe or fawn.
she looks pretty run down, bony along the spine and into the hams.
Yes, if you get more pics or sightings, keep us posted.If she's old she could be just carrying low and it be twins or more. Hopefully it's an odd angle and stance and you'll see her with 2-3 babies running around soon. Keep us posted.