She DOES suspect. Why is it so difficult for her to SAY something about her suspicions?? Are you telling me that this is something no one should figure out? That there is NO CONCEIVABLE way that NO ONE could POSSIBLY suspect that she is transgender even though she is still in the process of the change without her taking any hormones or having reconstructive surgery to correct her masculine traits?

If you can honestly answer that as a yes, then YOU are metagaming. Because that is not how it works mid operation. Unless Tess was born a woman with male plumbing, the switch from Male to Female is not so seamless. It is not something that you can change so easily and fool everyone, or even someone that has dealt with and is still dealing with. Tess is basically an unfinished building, a building that is only half done and still has the scaffolding. There is still evidence that Tess was a boy. Masculine women are still women. To an informed eye, someone can tell a masculine woman from a man. The voices are different, the ratios (hip to shoulder, hand to fingers, eye placement to nose and lips) would be different. The only way this scenario makes sense is if Tess looked, acted, and sounded like a woman, not an effeminate boy, but probably was a woman that had under developed testicles and suffered from a condition similar to Quinn's, being intersexed.

 As I said before, you can claim the power is "just a power", but that is metagaming in the most basic sense. I don't even think anyone in the X-Men series can just look at someone and know their powers or intentions with a simple look and no psychic abilities. 

What I have an issue with is the blatant hypocrisy. I can't use my character's familiarity with the process to go through a basic check of logic, and have her act on what she honestly believes that she knows about something that is visually apparent. But someone else, THE GM no less, can bs his way into knowing something that is supposed to be for us to show, under the veil of "it's a power".