Sherwood's Shadow (the Story of Robin Hood's Unheard of 'Enemy/Aly')

What if Robin Hood wasn't the only one who stole from the rich and gave to the poor? What if there was someone else in the shadows. Someone who was a competetor to what Robin and his band of Merry Men did...yet at the same time, an aly for when the going got tough. What if that shadow....was a girl? (I know, I know. The answers to what if questions is 'What if?' just ignore that for now....any who, please enjoy reading;p)