Forgot to add- you mentioned perhaps your mom is afraid to sit down on the toilet. My mom was the same. I bought “toilet side safety rails” on Amazon. There is nothing to assemble- they just fold out like a folding walker. They are super-easy to install (just fit over the regular toilet seat area), are no wider than the toilet tank, and are collapsible so we took them with us when visiting. I would just tell her to reach back for the rail, she felt much safer than just sitting down into the “void”.