Boy, nobody remembers Lady Frankenstein from the wonderfully awful film of the same name? Or the lady from The Atomic Brain?
There’s also one that I wrote for an unpublished story – FrankHolstein. She’s a Mad Cow Scientist who tries to create a Bull from parts she got from the butcher store, sewn together. She’s assisted by her twisted hunchbacked donkey assistant, Eeyore.
Would Cosima from “Orphan Black” count? I’d guess she was more of a quirky, eccentric scientist rather than mad scientist; but she was nutty enough to be pro-neolutionist (at least until the whole “intellectual property” issue came up.)
The only one that came to mind for me (despite the fact that I read Girl Genius three times a week - bad, bad brain!) was Veronica Cale, an enemy of Wonder Woman before the “new 52” reboot.
Well the first person to come to mind was Original Wonder Woman. She had a snazzy little place called Transformation Island where female criminals were reformed by being put in bondage … lots and lots and lots of bondage … and then lovingly dominated by women dressed up as drum majorettes. They learned to love their chains. Oh, we are talking Mad Scientist City here!
The other one I can think of that has not been mentioned yet is Dr. Carol Marcus of Star Trek, inventor of the Genesis Device.
Marie Curie to round out the list–hey, she managed to kill herself with her research into strange otherworldly energies, and what says “mad scientist” more than investigating things Woman Was Not Meant to Know? [oops–without, apparently, looking at the OP either–sorry!]