I think this is the first mention of Enid in about forty books. She's mentioned in book one, and then in book two I'm pretty sure, and then nothing. Granted, it's just the teacher going "Ms Rollins can you please read ..." but like it's weird that Liz thinks nothing of this. Mostly because even though she's back with Jeffrey French, who know goes by Jeff, which is stupid, because Jeffrey is a much nicer name imo, she's still obsessed with connor, even though he is not at all obsessed with her. Or interested in her. He's in love with Alanna, which is all kinds of unhealthy, but like ... Liz, WTF? This is a guy you barely dated, cheated on you, treated you like crap, dated YOUR BEST FRIEND BEFORE DATING YOU WHICH MAKES YOU DISLOYAL AF, and only ever made you unhappy. Jeffrey is literally a decent guy who just wants to be with you, and never makes you unhappy. Liz sort-of realises this, but also it's clear she's still deluded.