[ Oh, there's no way Minako is going to deny that Ami can be terrifying when it comes to studying - especially when you're lazy when it comes to that, like Minako is. So there's some silent agreement there.

But despite her own badmouthing of Rei, it feels kind of weird to hear someone else do it, so there's some defensiveness in her tone when she speaks up again. ]

Well, Rei-chan has plenty other good qualities! I bet she just got hurt in the past, and doesn't want that to happen again. Which means that it's a good thing that she's such an assertive girl!