I think there were a lot of factors at play. She was very ill but also didn’t have the best people around her. If it is true they sided with her cheating boyfriend when their friend was mentally ill and didn’t do to Caroline’s funeral to support Lewis then it says a lot about them.Doesn’t matter if they stayed with her 24/7 all it takes is someone determined enough to do it and she’ll find a way. They both have lives too, Lou has a daughter and Caroline refused am ambulance and medical treatment multiple times.
A suicidal patient of mine a few years ago her mum had literally just gone to the corner shop and back and she hung herself from the banisters, she survived and went home after a week - and a psyche evaluation. She lit herself on fire in their garden 3 days later while her dad was in the house and died from her injuries. That doesn’t mean her parents were negligent it just means she was sneaky, determined and very very ill.
I can’t imagine being in Lou and Mollies shoes in that situation.