I'm not a therapist so you probably won't agree with my thoughts and message but I wouldn't catch the bus, instead I would throw her under it, you know the right decision I think you just need a push in the right direction, you can't let her get away with hurting innocent people with lies, it will ruin many lives.
Prove your innocent, regain the family trust, forgive your daughter and support her, even when she's in prison for 14 years but to be sentenced to such a high sentence is possible in the UK but only if you accuse Politicians and the Government of a cover up and cost the tax payer millions of pounds, link below, murderers get less, in the UK you serve half your sentence with good behaviour, so there will still be time for her to live a normal life after release, your daughter doesn't sound stable, so can you imagine the physiological effect on her knowing her lies have caused her fathers death, suicide, she may ctb knowing all the pain her lies have caused, not just to you but to other innocent people.
I only presumed you were in the UK as I bought the same SN but it could be any Country I suppose, so the law could be different.
Carl Beech's lies about murder and child sexual abuse led to a £2m Metropolitan Police investigation.
www.bbc.co.uk