Kathmandu, May 25 (IANS) Nepalese mountaineer Purnima Shrestha has become the first woman to summit Mount Everest thrice in two weeks, local media reported. Purnima, who is also a photojournalist, first summited the world's highest peak on May 12, then on May 19, and later on May 25. Expedition Director at 8K Expeditions Lakpa Sherpa