I don’t think she realized at first
She did realized it before she asked him for help -according to chapter 7-
I felt bad for her but not now
It is selfish but that's love and the fact that when she confessed she asked haruna who he was always thinking of is such a nice move. Like gurl could not ask so he would not realize his feelings more "at that moment" and lead him on but no. So like I'm with her being selfish and thankful for being human trying a shot in love and stepping aside when she knows that she doesn't have a chance. That's love and her love was also beautiful.
Yah she knew about it that's why she at the end said "it's karma" so she knew it but trying hardest to get seme
So that girl knew that Nao is in love with Haruna and still she asked him to help her out! That's so selfish