By Kristy Dawson & Zesha Saleem A four-year-old girl is battling a rare buthighly aggressive form of cancer \- after doctors put her symptoms down to viral infection. Little Mya-Ela, from Stakeford, Northumberland, was diagnosed with stage three Burkitt Lymphoma after suffering from problems with her stomach. Her health issues ranged from an extended belly to constipation since being just two weeks old. Her mum Natalie, 29, feared there was something not right and took her to the doctors. But her symptoms were put down to viral infections. When she was three years old, Mya-Ela was rushed to A&…