Girl all the way.

Here's the difference.

Male: the area of the tail immediately after the cloaca is about the same thickness or slightly thicker than the area immediately before the cloaca.



Now look at Selena. Look at the thickness of her tail after the cloaca, then look at her thickness just before the cloaca. Her tail is thinner because it tapers immediately after the vent. males don't do that because their hemipenes are stored in the tail. This makes a male's tail longer and makes it thicker in that area.

The two lines I put here would be the same length if she were male. In some males, the lower line would actually be a bit longer.