Likely yeah, Grace already called us that we were acting like a children using her sockpuppet before. I bet she really do hates people who are immature in reality but for us we are not acting like immature people
Do you know if there were any background characters who might resemble Luna Girl?
She probably wouldn't have silver hair, I am thinking the white/gray hair she has in costume is probably a wig or an effect of her powers changing her hair.
It looks like her eyes are blue, so we know it isn't Cameron's sister (hers are green) but I notice in File:PJMC_23.jpg the girl on the lower-left in the concept art has blue eyes... and hair length seems about the same as LG