Very true. But Marrow is a pretty darn ferocious and vicious fighter when she wants to. She's got like Wolverine rage at times. Plus, her ability to never run out of weapons gives her an advantage, too.
Powers and Abilities:
hyper-accelerated metabolism speeds up the growth factors of her body, increasing her strength, agility, reflexes, durability and regenerative properties, and causing her bones to grow on command into oversized finger talons or various external shapes such as knuckle guards, blowguns, daggers, spears, and projectile spikes
I think, after a long fight, she would be able to eventually stick Nightwing pretty good.