@howardwizwald I agree that it is medication remnants. Looks like some didn't digest at all. The lady needs to talk to her doctor or pharmacist about forms that are either liquid, chewable or can be crushed. … Especially if this happens every day.
I do take a couple of medication that are in capsules… no other form of them. I sometimes see the remnants on the days I call “dump days”. Thankfully they don't happen as often as they used to.