Bluish light rises into one of three spheres that forms a triangle and hovers

As we were driving from Hamilton to Darby, we were about 7 miles away from Darby, and to the East, over the Sapphire Mountains, I saw three orange/pink orbs that formed a triangle and seemed to be hovering, not moving.  
At first I thought maybe they were part of some electrical towers until I saw a bluish white orb-like light that looked like it was rising into the bottom sphere (then I couldn't see that bluish light anymore), and then the bottom sphere rose up and disappeared until only two orbs of the triangle were visible.  
My mother-in-law looked over as the first disappeared and saw the two remaining orbs.  Then one of those two orbs disappeared, and the last orb finally flew away north.
Witness elects to remain totally anonymous; provides no contact information.  PD