! - Not if they want to reveal it as a big shock later down the road, only point to do so now is if it's to introduce a powerful ally that wont be around for a while or to keep an already established powerful and shady character relevant.

White martians have the same powers as green ones so they can shapeshift, also that is the white martians natural form.

3. But then how could she transform into that monster at the end? And who was that monster?

1. It implied she has powerful allies, no need to show who.
2. The character is gay in the comics AND was shown to be gay during her first appearance
3. No. White Martian