The tape!!!

In the tape Lucy is crying and very clearly looks mentally distressed. How were the school and her friends especially not clocking onto the fact that she could’ve been coerced into making this tape. Or even worse it could’ve been Chris threatening her. Everyone knew about Stephen’s behaviour and Lucy being a victim so why was this not a thought process? Also why did the school immediately expel her and not put her under investigation especially because Chris would’ve had 2 rape allegations (before they knew Lucy was lying) and he was not under investigation or expelled.