Sorry But I'll Be Re-doing This Book

So I've only seen four or five of these so i'm going to write one
Bella's Twin sister who stays home to do some of her school work online for a couple days before going to an actual school for the first time before, accidentally types in the wrong number of her mum's boyfriends number to contact her mum after losing her phone in the woods while on her walk,
but when she finds out shes texting an unknown man she starts to feel something different towards him than anyone else so she keeps her illness a secret what type of Illness you may ask a lung illness called chronic obstructive pulmonary disease (COPD) also the reason why shes got to sit out during PE