No visible craft, very early morning, outside, bright white illumination.

My mother was parked near a local state park--Seven Lakes, somewhat of a hot spot--when she was about sixteen. She was with a boyfriend, about one am. It was very dark. She had snuck out of the house. They were parked on a hill, listening to radio and talking. My mother had her foot dangling out the open car door, with her shoe kicked off. All of a sudden, a brilliant white light lit up the entire area. Everything could be seen, like it was daytime. She did not see an obvious source of the light, but she was quite scared. Everything was brightly lit, but not so much that it was impossible to see. A sort of very bright white daylight. There was no sound. She pulled her foot back in, slammed the door, and they drove off as quickly as they could. She was so terrified she does not remember if the light went away, or if they passed out of the illuminated area, though she believes the latter happened. The two of them vowed never to tell anyone, and she hadn't until a day ago, nearly forty years later.
Date is approximate.  We will invite the mother to submit a report of her recollection of the event.  PD