Precious picture.
My guess is that Mama left baby safely hidden under the table while out eating, knew exactly where the baby was & had plans to return. It is usually best not to handle the fawn, as some does will not take them back after fawns have been handled & covered with human scent. I'm glad you got the picture, but I'm especially happy for the fawn that Mama was bold enough to retrieve her baby. Happy day for all.