Thanks everyone! I've heard that they'll defecate less frequently with age, I'm just not used to her going this long in between bowel movements.. typically she goes within a week or so of eating, so this was new for me.
When I took her out yesterday she definitely looked "full" right above her cloaca, so I'll give her another few days (a week?) to pass it before attempting to soak perhaps.
At least now I know not to be overly concerned if she takes a while between bowel movements. Thank you again!