What should I do when wife cheats

I got married in 2011, it's been more than 10 years. Every thing was ok but My wife has done infidelity 3 years ago when she was working in a company, first time she felt guilty and asked for apologies in front of her parents so I gave her one chance and recently I got to know that she is again cheating me. When she knew, that I have all the proofs of her messages and recordings, she left my home and took my 8 year old daughter with her at her parent's house, and started working there and it's been more than 8 months, she is not coming back. In between, when I sent her a notice from lawyer mentioning all past life incidents and mental cruelity she is doing to me, she attempted sucide at her house. I helped her in that situation. After some time when I'm contacting her for divorce, she threatens me of doing sucide and false police complain. My daughter wants to live with me but she threatens her too. Lawyer suggesting me section 9 notice. What should I do?