I think you can only do so much in your kind of situation. I've heard that some chickens like to watch TV, haven't tried it myself so I don't know if it will entertain her or only scare the living daylight out of her
Just spending lots of time with her and giving her a little extra treats than usual should be good. Maybe get her a little toy or something she can do to spend some time. Can I ask, what happened to the other chicken?