By Jon Hebditch & Antony Clements-Thrower A courageous girl who battled and beat a brain tumour has hailed her “shining star” as she prepares to celebrate her birthday cancer-free. Concerns about Aurora Farren’s health were first raised several years ago when she developed an unquenchable thirst, was passing urine more often than normal and had stopped growing. Tests showed she had developed a rare condition known as diabetes insipidus. Lumbar puncture tests then showed that Aurora had cancer. On March 31, the brave little girl will turn nine but she spent her birthday last year in the high de…