Not to sound like I'm tooting my own horn here, but generally, I don't understand the "defecation issues" people on this forum seem to have. I find that with a majority of my snakes, if kept on a regular feeding schedule (both time and size) I could damn near set a clock by their defecation.
Once again, beginning a paragraph with a disclaimer, not saying this is the case here either, but I don't power feed in terms of size or frequency. One good sized meal each week, same day each week. Slow and steady approach. It makes cleaning and feeding easy as I can often do both at once. Let them eat while I ready the new tubs and when the finish, put them in the new tubs and they go back on the rack, then I clean the dirty ones and stack them up to repeat next week.
But all in all, I hope she is not blocked up and everything passes with ease.
Good luck!
-John