#3 AJ Lee

AJ Lee is one of the most important women in WWE history, but the company won't acknowledge that. She was a women's wrestler in the era of Divas and found various ways to stand out.
There wasn't a shred of doubt that during her peak, there was no woman in WWE better than her. It's a shame that she left so early because it was only a few months after retirement from wrestling that the Divas division started making the eventual transition into the Women's division.
Female superstar says she inspired John Cena turning heel HERE
It would only be a year post-retirement when the WWE Women's Championship was introduced in a new lineage and with the inflow of talent from NXT that would happen, there's little doubt that she would have been perfect for it.
However, due to various circumstances, including her husband CM Punk's firing, AJ Lee decided to call it quits in wrestling at the age of 28. Had she stayed, she would have continued to be an integral part of the division and would have fit in perfectly with the growing crop of female talent on the roster.