Mildred Cable : through the jade gate / Janet & Geoff Benge.

Enhanced descriptions from Syndetics:

Standing atop a mound of rocks, Mildred wrapped her blue padded jacket tightly around her and squinted against the sand-laden wind. To her right the Great Wall wound east for fourteen hundred miles until it reached the Yellow Sea. Before her lay the rocks and sand of the vast Gobi Desert. She would enter this feared place in peace--God was here too.Missionary trio Mildred Cable and Evangeline and Franscesca French were the first Englishwomen to cross the infamous Gobi Desert, living for years among the diverse peoples of northwestern China in places few Europeans ever reached.Educated and rich, Mildred Cable once planned to be a concert pianist. Instead she served the people of China through wars and revolutions. Whether speaking the truth to a brutal general who held her prisoner, educating generations of Chinese girls, building self-sustaining Christian communities, or traveling the ancient Silk Road on a mule cart, Mildred followed Jesus with grit, determination, intelligence, and faith.