Just wondering, do girls...

She's Ms. Garrison.
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Firstly, best woman growler is that chick from Thorr's Hammer (a US doom death band with lyrics in Norwegian). She may pretty much sound like an American trying to sing/growl in Norwegian, which is what she is, but she sounds really good.
Kittie is a beyond shitty Canadian nu-metal band. Also, the women in the band are nasty as hell and the drummer is a fatass.
 
I know some of Astarte's stuff but I'm not really a fan. The blonde in the band is really hot though.
Never checked out Supremecy.
I know there are some other bands with girl members that are really good.
Doro is a really awesome girl metaller. But Sabina Classen from Holy Moses is my favorite. I think Holy Moses deserved as much credit as Kreator and Sodom.