The White Knight incident happened 10 years ago and according to the explanation, that means that the currently 24 year old Chifuyu would have been only 14 when it happened.
...which would mean... she's a freakin *monster* in an IS.
Well, she DID stop Laura's attack with a training IS's katana... Something tells me that she could collectively spank the haremettes' asses, even with their upgrades, in a 5 vs 1 duel. Not that she'd go without a personal IS for long - Tabane would literally
orgasm at the thought of making a personalized IS for Chifuyu.
EDIT: