Dreams can often be a reflection of our subconscious thoughts and feelings, and encountering someone in a dream whom you later meet in reality can feel quite significant. This experience might suggest a few things:

1. Intuition and Recognition: Your friend may have an intuitive sense that allowed them to recognize this person even before meeting them. The dream could represent a deeper awareness of connections that transcend time and space.
2. Symbolic Meaning: The girl in the dream could symbolize certain qualities or aspects your friend was seeking in their life at that time, such as friendship, love, or adventure. Meeting her could signal that these qualities are now becoming more prominent or accessible in their life.
3. Synchronicity: This experience could also be seen as a form of synchronicity, where meaningful coincidences occur. It might suggest that your friend is in tune with certain energies or events in their life.

Encourage your friend to reflect on their feelings before and after the dream, as well as their thoughts about meeting this person. This might give them deeper insights into the meaning behind this intriguing experience.