answer:It means that something has triggered the memory of her. Memories from one’s past never disappear from your brain. I still dream from time to time about people I haven’t seen in 50 years, and when I analyze the dream I usually realize that something good or bad is going on in my present that has caused my subconscious to spit out a vaguely related memory from from earlier times. When thinking about dreams, don’t focus so much on the dream’s imagery (in this case, a previous crush) but rather on how the visual makes you feel. You might also search “dreams” in the ask-public searchbar, though for me it doesn’t seem to be working right this minute. Dream questions are asked A LOT.