Ginger's Ghost Story or Guardian Angel?

from Ginger

One night when I was about 8 years old; my mom, little brother, and myself were coming home from church. We were on a lonely stretch of highway at the bottom of a hill just passing over a small creek. As we started up the hill on the opposite side of the road, traveling in the opposite direction, was a lady in white. She had long dark hair, she was young, she had on a long white dress, which was from an older time period. We could see her, but could also see through her. She was floating down the side of the road, she had no stride as a person does when they walk.

We were all kind of quiet for a moment, then I spoke up and asked if anyone else had seen her. My mom affirmed that she had, and so did my brother. It was strange because even as a young child witnessing this, I wasn't frightened. Many years later my mother told me that this was not the first time she had seen this woman/girl. My mom had seen her before when she was younger. Could she be a guardian angel?