In Crisis on Infinite Earths #4, Barbara is frightened of dying for real this time, so she calls her best friend Kara and confides her fears to her. Supergirl right away tells her she doesn't need super-powers to be a hero.
Supergirl: Batgirl — you called me? Batgirl: The city... it's so empty. Mostly everyone is staying inside... with their loved ones... awaiting the end. I — I think this time it's really coming. Supergirl: I know the feeling. And you're right — hardly anyone's outside. Not even the criminals. But there must be a way to stop whatever's out there. I'm not ready to give in so easily. Batgirl: Supergirl... Linda — I've faced death so often because I never truly believed I would die. But now — Now I feel so useless, so helpless, so worthless — and so very, very scared. Supergirl: Everyone is, Barbara. I've spoken to Superman and the Titans — They say Flash may have died. And other heroes... some villains, too — have disappeared. I'm scared, too — but I can't let that stop me from doing what I have to. Batgirl: Easy for you to say. Look at your powers, I-I'm nothing. I-I don't think I was ever cut out for playing hero. Supergirl: Barbara, there are thousands of people out there — without powers like mine... the police, firemen, soldiers — They're all ordinary people trying their best to keep this world from falling apart before its time.
Oracle: Just rest easy knowing you did something special today. Supergirl: You really think so? Do you think this one day is going to make a difference? Oracle: I know so. Never discount the healing power of a little hope, Kara.