Confusion that is fairly sudden onset inthe elderly is sometimes related to an infection but also constipation can cause it, sounds like extra fluids might help until she can be properly assessed,
can you be bit sneaky,,, does she like jelly as that is almost all water a couple of pots of that a day might get her fluids up without her noticing or some slices of melon, or thinnish soup
if the bowel stuff is for loose bowels she might have bunged herself up a bit,
Good luck she sounds like a grand character