For now we will stick with the litter she’s used to so as not to change anything too soon. Being re-homed is enough of a change! Ms1995hoo thinks she might want to try something less granular for exactly the reason you note (enthusiastic digging), but she conceded the validity of my thought of not changing things too quickly when she’s using the boxes.
We have to figure out a better location for the box here on the second floor. It’s in the powder room and takes up too much space in there, but there isn’t really anywhere else on this floor.