Class Reunion Ghost Pictures

Jen sent us some pictures taken at her class reunion. Did a former classmate show up, too? The orb in these pictures look especially suspect during the class picture...almost as if this spirit were posing, too. The streaks of light might have been caused by the camera flash settings...some of the "night modes" will produce similar effects of blurred lights, etc.

"I went to a 15 year class reunion, and took these pictures. We had one person pass away in January of this year. I believe it was her in this picture, and the other pictures are just plain cool. Can someone tell me what the streaks of light are?"