Fast moving red 'dot' in the night sky, suddenly made a sharp right angle turn and flew into space.

My niece and I were riding horses and star gazing around my sister’s fenced acreage just outside Ponca City when we caught sight of a very fast moving red ‘dot’ high in the night sky.  It was moving way to fast to be an airplane.  
Being a little older than my niece, I joked that it was a UFO, just to see what she‘d say.  She was about 14 years old and very level headed for her age.  "No," she said, "It’s probably a satellite."  
I agreed with her and we watched it together as it moved completely across the horizon from left to right in less than a couple of minutes, then about ¾’s of the way, it suddenly made a hard right angle turn and shot off into space and out of sight.  
I’ve been watching the skies ever since and in all these years, I’ve never seen anything like that again.  But it convinced me that ‘they’ are out there.
Date may be approximate, although the witness does not indicate that fact.  PD