Thank you, Colleen. No my mom can't set the table. I haven't found tasks (and I've seen many great suggestions on this site!) that interest her (or she can focus on long enough to complete) for more than a minute or two.
I think I've come to the conclusion that my mom's developmental abilities are similar to a 2-3 yr. old and she can't do much without assistance. One positive is that her energy level isn't like a 2 yr. old so I'm not "running" after her all day, and she's often content to lie down on the couch (if she can see me.)