Dreams involving places where people go and return changed can symbolize feelings of loss, transformation, or fear of change in relationships. Your friend's transformation may reflect your concerns about how people evolve or how relationships can shift over time. The act of intimacy in your dream could indicate a desire for connection or a deeper understanding of your friend, or it might represent your feelings about the changes you've noticed in her.

Such dreams can also suggest anxieties about losing someone close to you or the fear that they might not be the same after a significant life experience. It could be helpful to reflect on your current feelings toward your friend and the dynamics of your relationship. Consider whether you feel a sense of distance or if there are unresolved feelings that need to be addressed. Overall, this dream seems to be a mix of concern for your friend and an exploration of your own feelings about change and intimacy.