Back when there was only 1 chapter, I asked why the Gay for Pay tab was used, since there was no indication of her being straight.
After chapter 2, I still stand by it. Her het declaration is the equivalent of a kid claiming that they didn't break the expensive vase, and it was instead the invisible monster.
... So? She's still working as a call girl with an exclusively female clientele, initially and so far only for the money, and has repeatedly denied being a lesbian whenever the subject is brought up. Just because it's plainly obvious to us readers from the beginning that she's in denial doesn't change the fact that she explicitly declared herself to be heterosexual and evidently thinks of herself as being that even when alone to her thoughts.
It's kinda like how Danbooru tagging works: Tag what you see, including the dialogue.