I spend 30.000+ Energy at Bonus Stage no Sayuna Matsumori and she is suposed to be N. I dont think she is at Bonus Stage.
GHQ only drop the girls shown and she is not one of them.
Stages only drop the girls shown and she is not shown.
Sunday GHQ was changed at 12:00 moon UK time. Maybe they permantly change the girls GHQ drops.
Two girls was in the past added by mistake and removed after a few hours.
This two girls was only obtaineable for very few hours and most so most players even P2W are missing those.

Maybe they done this again ??

It is strange that Bonus stage have girl which no stage drops same is true with GHQ.