For a young woman to find herself alone in a desert, her health and reputation is being jeopardized by her indiscretion.
She should be more cautious.
Deserts are generally barren with little vegetation or animal life. The desert in your dreams could be bringing up issues of stagnation and periods of little growth in your life. Also, the desert could represent your loneliness and feelings of isolation.
However, if you live close to the desert or love the desert, this may be a positive symbol.
For some the desert may be a place where they can commune with nature and feel a sense of peace.