Will plant roots damage sheetrock?

no It won't cause damage

I would get it out on general principle. The little root tendrils are digging into something.

They are going to be a mess to clean up after. It looks like a pothos, so you could clip it way back and root the cuttings. Sounds like you may have a couple of fights on your hands. Good luck.

This plant is a golden pothos philodendron. It will not harm the sheet rock. Move the plant out of the bathroom, or better still, cut it back so it's smaller. It will not want to grow down the drain as it will seek light, not the dark of the drain. If you are concerned about it anyway, plug the drain. Being unable to use the tub due to a houseplant is not a practical or logical way to live. Move the plant to another location.

I've had the root tendrils actually dig into the sheetrock. My pathos was on a shelving unit and one branch ended up going behind the unit. When I finally tried moving it, the tendrils were indeed imbedded in the sheetrock. The damage wasn't particularly bad and not hard to fix, but to understand that it truly can cause damage is important to note.

If selling the house the plant will have to go. No buyer will want a plant overtaking the tub and bathroom. Have your sister remove the plant and reclaim your bathroom again.

Won't damage the sheetrock but if allowed to go wild as it is it can dig behind it. Also can get into the drain. Why in the there anyway? Trim the branches back. Best to get it out of there. Reclaim the tub.

It Will damage the sheetrock. It will make little holes.

If the bathtub cannot be used for bathing because the plant is occupying the space, where do you bathe? In the planter?

This large plant my also stain the paint on the drywall.