Wonder Woman is a weird character with a weird origin story and weird powers. She worked in a cheesier time, but for her to work now, I think her backstory would have to seriously be re-designed. Daughter of the Gods? Invisible plane? Magic lasso that makes you tell the truth? Just too goofy. I can barely suspend my disbelief when she pops up in cartoons anymore.
I think Catwoman could work well as a live-action series, as she is also a fairly independent character that wouldn't require shoehorning Batman into the story (not that you couldn't).
DC is a boy's club. There are plenty of female Marvel characters that could support their own series, but unfortunately you just don't have that many if you're exclusively looking at the DC Universe.