Natty, I don't think it's bad enough to get Mark home early.
I have a thought on the wipes and baby powdering the TP: Because Lactulose causes diarrhea and therefore irritation, she was trying to find some way to make it less irritating when she wipes and to make sure she's clean (with the wipes.) That takes some reasoning power.
All I can suggest is to just wait and watch. She may find the bed uncomfortable...her position in the chair may help with the tummy pain.
When is her next doctor appt.?
Hugs,
Connie