not to be a downer, but i am an RN working as a surveyor to regulate care in nursing homes.
many of the saying here are "funny" and things we may think sometimes but never say.
nursing homes and their staff get a bum rap so i'd think you might want to go a different way. maybe saying about the elderly, gray headedness is the crown of glory, things about wisdom with experience, treating our residents the way we would want our family or us to be treated, etc.
that said, whatever you think she'd like is best.