My niece rode the Safari at 6 or 7 months pregnant. We’re aware of how bumpy it is compared to our county gravel road. Safari is smoother. My unpaved driveway is smoother than that gravel road.
Getting into a truck requires fitting thru the doors, which may be more than her core muscles are ready to put up with.
Which is the other thing to think of - how much core is invested in accessing the seat.
Carousel of Progress - not much - if she doesn’t move down the row much, or sits in the back on her ecv. Enchanted Tales with Belle - not so much. Same with Tiki Birds.
Having been to WDW while recovering, I can attest to how much contentment can be obtained from simply being in the park and watching the World go by.
Example: find a quiet place by Aladdin and watch the camels nail the guests.
One trip we left DH and our 9 yo granddaughter on a bench outside Space Mountain. When we exited the two of them were interacting with the guests on the Speedway. Having a blast talking to the riders as they entered the first curve.
I noticed on a subsequent trip that the bench was removed.