The earlier chapter was kinda vague, but I thought she was serious about going out with him.
Like I know she didn't start the relationship with love, but I was assuming she seriously wanted to consider falling for him, even for the sake of manga. She never said herself that they're pretend dating.
But based on this chapter, I guess she really didn't consider him romantically at all. Like she did think that their relationship was fake.
Now it makes sense I guess.