@SSJR2 I don't think she is oblivious to her feelings at all. In a previous chapter we had her talking to her friends about the promise she had made with him (about when she would be willing to be a couple with him), and that she interpreted it as already being fulfilled, while he told his friends that, since he wasn't taller than her, yet, he didn't think it was fulfilled. It was also discussed between the two, that neither of them had forgotten the promise, or wanted it revoked (though not clearing up the misunderstanding that she thinks the conditions have been fulfilled for him to ask her out again and he doesn't think so, yet). Even in this chapter, we see that she expected to go with him to the cultural festival.
She is just patient and waiting for him to progress at his own pace, so that she isn't rushing him. Her brothers also see it as a done deal that the two will end up together, not just because of his feelings, but also because of hers.