Well she seems to making progress with her denial, at least.
Shiraishi on the other hand was already expecting a confession, and probably would've said yes.
Edit: went back and reread this for a refresher, and I noticed something I hadn't before.
At the beginning of this manga, the PoV was split fairly evenly between Shiraishi and Ayame, but ever since ch6 we haven't returned to Shiraishi's PoV once. I'd be willing to bet there's a reason for that.
Current theory is she knows Ayame is into her and is mistaking Ayame's constant gay flailing about for a deliberate, if a bit awkward, courtship of her. Shiraishi is shy so she's probably waiting for Ayame to properly confess, but on numerous occasions it really reads like she's deliberately hinting to Ayame that she reciprocates. In ch8 she even outright tells her she would be cool with them dating (with the implicit additional meaning of "so its fine if you confess, you don't have to be afraid of rejection") and follows that up by snuggling up to her and saying she likes her. And yet Ayame stubbornly, deliberately refuse to take the hint.
Shiraishi must be feeling a little frustrated at this point.
Even in this chapter she was very explicitly expecting a confession at the end.
I bet we're gonna snap back to shiraishi's PoV at some point soon to reveal something like this