She might not be a top student in the academics, but she just proved she can both have the cake and eat it, as Yuu already promised to make more. There was also a promise about teaching, but I bet the cake is more important.
Yuu can make a cake? That's news to me, I thought the cheesecake he brought over from Ch.30 was store-bought. Yeah, he's gotta join the cooking club with skills like that.