A mum is alleged to have fatally poisoned her own daughter with tainted wine at a holiday dinner as police probe whether she is linked to more mysterious deaths. Gudrun Casper-Leinenkugel, 52, is alleged to have killed her daughter , made her other sick as well as the woman's boyfriend in November last year, prosecutors have argued. Daughter Leela Levis shared the wine with her sister and her sister's partner before they tucked into the family's 12-person Thanksgiving meal. Casper-Leinenkugel,