1. If her suicide attempt succeeds you may be prosecuted for her suicide. To obviate the consequences which are likely to ensure from her suicide you should write to the local police informing it about her suicidal tendencies so that you are able to create a veil of protection for yourself in the event she ends her life.
2. The legal options in front of you at this stage are to file for divorce on the basis of cruelty and also file a case for child custody to get back your kid. In divorce the court is likely to order mediation to reconcile the differences.
3. If she files another case for dowry them contest it by entering your defence in the court.