It's very cruel for Momo, but at the same time I hope this also serves to drive her character growth into something more than just a thirsty Menou fanatic. It's bad enough that the real Akari is also effectively revealed to be another thirsty Menou fanatic. I feel like causing Momo to go berserk was not just an act of expediency, but also an act of sabotaging her love rival.