Well, if tickling with a cotton ball pulled out of a stock bottle of colace makes you furious, then I can only imagine how you'd seethe seeing a CNA take your mother to the bathroom, and then not wash her hands with hot soapy water for as long as it takes to sing "happy birthday to you", and then wheel her down to the dining room. Or for that matter, touch a doorknob or a surface that someone else touched after using the bathroom!
I say for the sake and safety of your grandmother, bring her to your house, and take proper care of her! It's the only safe thing to do!