Dowry blackmail by wife

Hello I am Australian citizen and I have married woman in Sydney, Australia in July 2020 with courtship time of more than 1-year. We got married in Sydney as registry wedding followed by a small party with few guests. This is a love marriage and I have bared all expense. My parents/sister had visited her family in 2019 in India for a mere 4 hours to get to know each other. Since, then my family never had any contacts with my wife's family. My wife is diabetic and she has a past where-in her ex-husband (also Australian citizen), their marriage broke for unknown reason, she tells me that they had demanded dowry and my wife had managed to get him arrested in Australia and put him in prison for 3-months and his family is facing dowry case back in India. This was my first marriage and knowing all this, I went into this marriage, as my intention was to give her a better life seem to have faded now, as unfortunately, this tide has turned on me now. Since last 4-months, my wife started legal language at home in Sydney like - give me writing that (me, my mom, my sis is responsible for my wife's health - forwarding emails to my sis about stop torture and involving in our lives - she checks my phone - else she will commit suicide, basically threaten me). I was made an emotional fool, which I should have realized much earlier but I thought of giving her more time, as my family is completely independent and this is a love marriage and my family got scared and they had blocked my wife's contact because of abusive messages, they still get unknown calls. My sis lives in Sydney and she has also filed a cybercrime report Australian Cyber security for an online hideous incident, as my wife has criminal thought-process from her previous case. I can say this because I used to live with my wife. Now, I have left home in Sydney and my wife is back at home as I could not bear this anymore and lost my self dignity and I have failed my parents. She has abused me with accusing that I have girlfriends everywhere, my sis has already faced online hideous incident and my mom of dowry demand back in India. The only evidence that I have is - my wife's abusive and vulgar text messages about my sis and accusing my mom of dowry plus I have texted her brother about her abuse like filing FIR, dowry, forwarding my family contacts to random people, to my message her brother was silent i.e. no response. I hope you understand the gravity here. My wife can travel back to India and may give a surprise. I would request a legal opinion as my mom is alone in India and me living far away. Regards