And would you be transporting it on it's own? as that would increase the stress on the animal too.
If you do transport it I would do so with another animal for company (maybe take a couple of your own), and make sure they have limited but not tight space, just so that they can't get thrown about en-route.
Better to make it other sheep she knows, it's also stressful being put with strange sheep. So buy two or three together and run them together.
We generally try to buy sheep in groups, and not split them up. Occasionally that doesn't work, one has to join a new group on her own, and it always takes ages for her to settle in and make some friends. Often that sheep will always be a bit of a loner.

Personally I would not transport such a heavily pregnant ewe such a distance, no.