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the Donnas !!!!!!!!!!! man
Paramore and Evanescence are female fronted, but I don't know any all girl rock bands :P AKB48 is all girl, but they're pop and not hardcore xP
There's a wiki with a list of every all-girl bands that exists right now if you actually have to patience to read through it all xD
I think Cherri Bomb are good. You should listen to their cover of Teenagers on youtube :)
Kittie, I've listened to some of there stuff.
RazorBladeKisses are a Goth Lolita band from England, they have all female members (at least I think they do, one might be a male). But that's all I know.
And you know that hardcore stands for hardcore punk, right? Yeah. I don't know about any hardcore bands who have all female members.