AUGUSTA — The family of an Augusta woman who was hiking in Nepal when a deadly earthquake struck has not yet been able to reach her but remains hopeful she’s safe. Dawn Habash, 57, a yoga instructor from Augusta, last communicated with her family on April 17 as she was setting out on an eight- to 10-day trek in the Langtang area, which includes Langtang National Park, north of the capital Kathmandu. Habash’s family, many of whom also live in central Maine, are staying optimistic in the face of numerous aftershocks and a death toll that has climbed past 4,000 people. “We’re waiting patiently and holding out with positivity that it’s just a lack of communications, of electricity, barring us from reaching her,” said Habash’s daughter, Yasmine Habash, who lives in Alaska and was traveling to Maine on Monday to be with her family.