The ghost in white is lonely and lacks vitality. They are characterized by long hair fluttering and listless, representing depressed mood. White symbolizes purity and nobility, but when it is combined with ghosts, it represents the lack of strength and vitality, and represents paleness and powerlessness. In the dream, this kind of female ghost often appears alone and is very lonely. Because an essential feature of depression is loneliness.
Crossing the bridge represents a desire to reach the other side. On the other side, there is always a place to look forward to, with dreams and hopes.
The ghost in white wants to arrest you as body double, which means death and loneliness, and wants to control your mind.
Blue light came out of his head and looked like a deer. It looks like Harry Potter defeated dementors with magic. In fact, Harry Potter later understood that the patron saint is his own belief.
What I want to say here is that Jung's dream interpretation theory is good at analyzing myths and legends and works of art. The final image of your dream fits this feature very well.
About dreaming of ghosts, some psychologists say that being kind to ghosts in dreams is actually being kind to your own mind, because ghosts are a psychological stage of your own mind and a kind of sub-personality.
With your own beliefs, you can not only make friends with ghosts, but also make friends with ghosts, so that ghosts can become guardians and guides, not resentful spirits. This is the best way.