Hmmm... her udder doesn't look ready to me, but you just never know with some does. Typically they get very full/tight and shiny.
Our does will usually want to be off by themselves, they may talk to their babies, stare at the walls/ceiling, Paw at the ground/bedding, some are so into it you'd think they were digging a hole to china lol
Some will be up and down, up and down. May even become very clingy.
We had a doe that would throw a major fit if I wasn't right there with her. We even had another doe and baby in the stall next to her, but nope, she wanted me.
Also...stretching. Most does going into labor will give some good stretches now and then trying to get babies in position. Sometimes, that process can seem to take forever.