Erin Jayne Plummer’s friends want the circumstances surrounding her death to be investigated. The 42-year-old presenter took her own life last month after a battle with mental illness but those close to her insist she wasn’t suicidal and wouldn’t have wanted to leave her three daughters without a mother. A friend told Australia’s Daily Telegraph newspaper: “Erin was truly the most beautiful soul I had ever met. “No words can describe how special she was and the love she had for her three girls. “She absolutely adored her girls. There is not one person who thinks she would have left her beautif…