Just to point out, the "She's in a good mood today" is wrong.
It's not Minami's thought, but rather Iori's, she's thinking that her...plan? to be on top is going well.
Basically it's more of "Feels like I can do it (be on top) today"
Which is why she's so upset when Minami casually flipped them over and ruined her anticipation.
so maybe something like "Alright, today I-"?