07/03/90 Lake Tahoe Ca Circle 1-3 minutes It shot into our view about 50 ft away and then shot out of sight after a few minutes

The time we seen this UFO, there was three of us girls on a bed and talking. We were in an A-Frame house. The bedroom had long windows that looked out into a grove of trees. The forest was pretty thick. I looked up and seen this circle object come into the sight of the windows. From the distance of the house it was probably about 50 ft away. The size of the craft was about 20 ft wide and about 4 feet in length. The color of the craft was a shiny silver. But the lights going around the outside of it were very bright and lit up the area where it floated. It just hovered there for about 1-3 minutes. I don't really know how much time passed but it seemed to be there for quite awhile. I got the attention of the other girls in the room and we all just stared and awed at it. Just as soon as it came, it jetted out of sight with no sound made. Even while hoovering in the grove of trees there was no sound.
We ran across the street to my moms house and told her about it but she didn't believe us. This is the first time I have mentioned it. I was watching a UFO show on tv and wondered if it was too late to report this.  I am 34 now and this happened when I was 16. I don't even know if this is worth reporting now, but hopefully one more sighting even if it was almost 20 years ago will help.
Witness indicates that the date of the sighting is approximate.  PD