User blog comment:Bennlimos/HxH Questions & Thoughts Discussion 11/@comment-5780397-20150511101832/@comment-5780397-20150515082818

1) Hisoka's "Texture Surprise" has been recognized as a Conjuration ability, thus you can't discover the trick using Gyo (I don't know if it was ever stated, but Squala and Kurapika would have realized that the Scarlet Eyes were made by Nen otherwise, and Killua would have found easily the palace where the Phantom Troupe was into). Beside, she had no reason to check, and Hisoka was grating on her nerves. I still don't understand why he pretended to have the tattoo, though.

7) I think it's hinted. When going up, she says something like "Pitou's En is Gon... I won't have another chance like this" (At the moment I don't have the volume at hand, so I can't tell you the exact words), and the fact that she committed suicide as soon as she felt Pitou's En seems to suggest that she would have never moved if Pitou's En was active.

The fact that she infiltrated the palace with Marcos while the En was not active is probably a mere coincidence.