Oh, yes... you'll need a "Johnny Bravo" Eddie, then!
More seriously now, GCR is a powerfull toon, but she can be taken down easily... sometimes, because she becames a real menace when paired with the right companions, and as soon as I get close to the higher ranks, I see a lot of defenses which have her amongst other best PvP toons. Those defenses are pretty hard to beat.