I watched that episode the other day and thought the same thing. I think her character is horribly written but I also think it might be wearing on the actors just how horrible this show is.

My one and only complaint was what was with the weird green screen with Conan? Did I miss something where it made sense that it was so bad? I kept waiting for it to make sense. Was he just not able to get away from LA?

Okay it took me many seconds to get the great-grandmother bit, since I only got it reading your comment. I'm dense-er.