Look up family cloth. :) At least she would be using something!

your username was my reaction

I recommend a bidet in this case, you never know, she may buy the idea since no paper required for those :p

that is nasty as **** yo.

Oh. Oh god.

Get a bidet, so she can wash her backside instead of using TP.

See if there's any alternative she might prefer? Other comments have suggested a bidet or wet wipes. It's important to acknowledge that a number of health problems could result from this habit of not wiping, so maybe use that argument when attempting to convince her to use an alternative. Good luck OP, it's not a situation I'd relish being in.

So she pretty much has a giant rashes along her butt 24/7?

Your grandmother is disgusting.

I was about to start eating my dinner whilst reading this fml....FML.