Can't believe I'd never heard of these guys before today:
DAYYYYYYUMM. That woman can SING.
Reminds me a lot of Kobra (aka Brittany) Paige from KOBRA AND THE LOTUS. Another chick-fronted band with great music and killer vocals.
In my opinion, there aren't actually that many female-fronted metal bands that are really worth listening to. There's, oh, let's see... NIGHTWISH... DELAIN... the aforementioned KATL... Floor Jansen's REVAMP (but that's because it's Floor freakin' Jansen)... AMARANTHE, I suppose, just because they're so damn goofy... maybe XANDRIA...
Yeah, that's about it.
Oh, right, and these guys:
If, on the other hand, you're just interested in pure over-the-top murder & mayhem, that's what STRIKER are for: