Can she do anything else besides quick lil' singles? No.
I don't think anyone argues that Rihanna is not a singles artist. But that's all she is. So take what you have and be proud with it. God knows you don't get a lot with this woman, not from her, not from her music.
Is the audience still paying for the tour only to come and do her job? Or does she actually sing on this one? I'd say it's the former.