Chris Anderson
Dr. House of Chameleons
As for the OP question. Im gonna go against the grain and say it is still female. I had a female tht I bought as a male tht looked EXACTLY like yours until she was about 10-11 months old then she turned orange/pink. Before then she was gray with lots of blues and greens like a male.
Color isn't always a good indicator, as you mentioned, but the swollen tail base that can be seen in the photos is fairly reliable, especially when coloration agrees with it.
Chris