Sarah Ferguson, Duchess of York is proving to be “very resilient” amid her cancer battle. The 64-year-old duchess has been diagnosed with malignant melanoma, months after undergoing a mastectomy to treat an early form of breast cancer – but Sarah is determined to keep fighting amid her health struggles. A source told the Daily Mail: “She’s very resilient and she does bounce back from things quite quickly but two diagnosis of cancer in six months, particularly when she thought she had just got over the breast cancer, is a lot for anyone to deal with and process.” Sarah recently revealed via soc…