I would sacrifice one meal to soak her and get the skin off if it's bugging you, and it might stimulate her to eliminate too. But don't worry about the pooping part, they'll go when they're ready. Seriously, I remember a post on here a long time ago about a blood python that held it for 9 months.

I kind of prefer when they hold it in and go all at once - fewer cleanings! Haha.