What an incredibly disturbing dream! Maybe she'll return and you'll have another chance, who knows? Don't get caught up in this one specific dream, though it sounds like it was powerfully significant for you. Focus on the parts that stand out to you. Reading this, the colors seem important, the duality between white and black along with purple, a color associated with royalty, power and spirituality. I usually note a dream is interesting due to animals, like the horse she rides upon. It also stands out that she asked you to join her, then tells you to leave when you draw nearer. The most clear sign seems to be related to life (pilgrims - religion, kissing, fire) and death (the house, the mirror, the garden).

Maybe your love of the girl is symbolic of the love you bear for something in your life that in truth causes fear and darkness, though you don't see it. Or perhaps it is a warning that you're attracted to good things, but they'll lead you into grief and despair. The rush of adrenaline and terror caused by the reflection of evil was what woke you up, a physiological response to wanting the dream to end. More likely than anything, it was simply a nightmare, your mind disturbing you to promote change or growth. There's no real way of eking out absolute meaning from personal symbols, and dreams are murky waters. Learning lucidity and conversing with the purple-eyed girl could help you unravel this tantalizing mystery.