To dream of an aunt represents a substitute form of intuition. Your gut instincts about the future or to make long term choices that is influenced in some manner.
Negatively, an aunt is a sign that you feel unlucky or that your gut instincts feel off.
Positively, an aunt may reflect a heightened sense of luck or that your gut instincts are unusually accurate.
Alternatively, an aunt represents a quality in yourself based on your most honest feelings about them. Ask yourself what memories or feelings stand out the most about them and see how that quality may apply to your own life.
To dream of a dead aunt may reflect feelings about alternative outcomes in your life reversing. Alternative methods of approaching problems no longer being necessary. Feeling that your lucky streak has gotten better after first being oddly unlucky. Ridiculous periods of time of no progress or stagnation ending. Consider the qualities about the aunt that stand out the most and try to see how those qualities may have disappeared from a situation in your life.
Example: A man dreamed of seeing his aunt. In waking life he felt like nothing he did worked or he could never be lucky at all. His most powerful memory of his aunt was of her telling him he couldn't have candy. In his dream she reflected a intuitive choices that never let him feel good.