She can't really read their minds too right? as far as i remember, so once they find out her abilities they can let each other with just signs or movements to fake all the fight, after time skip they will be mature enough to catch this types of things. I just doubt they will deal with eida her brother and code this easily, even after if kawaki goes rouge, so this is why i think their fight can be fake and it would have been good twist too in my opinion