The bit I found interesting was when the police turned up, she admitted to most of it, apart from insisting that she didn't start it ("The first ones didn’t start, like, with me"), putting it down to "random, or whatever". She has admitted to everything else so why not just say she started it and it got out of hand? Unless it was someone else that she knew had originally sent the messages and she was protecting them... Therefore I think the daughter started it and was aware of what was going on. She didn't seem too surprised when her mum was confronted. Many have put it down to shock, I'm not so sure. I definitely think there is a lot more to it than what we know!