Ok, so the mute girl doesn’t seem to know the other girl is a Teep (slang for telepath from Babylon 5). She suspects it, but disregards it because it’s outlandish (hence supernatural tag).
What I’m curious about is why the Teep keeps her powers a secret? She’s gotta be using them to her advantage somehow... maybe by reading the minds of boys and warning other girls of malicious/misogynistic intent, then being compensated for it? It explains why she’s attracted to mute girl since the boys aren’t very nice in that school. Mute girl’s thoughts match her physical attempts to communicate while others may think one thing, then do something completely opposite of what they thought... like lies, lies and more LIES!!! At least, that’s what the Teep probably thinks.