Another program that might be interesting for her is the new celebrity cook off hosted by Rachel Ray and the host of Diners, Drive-ins, and Dives. Competing teams of celebrities, each headed by one of the hosts, compete. I think Summer Glau likes to cook from what I have read.
I think the cooking show is the best idea. Those are always fun both for the audience and the celebrity and Summer likes to cook as you said. I think she'd enjoy it more than a talk show for example.