Another Skyline video that might be helpful.
As the 40th anniversary video it tells the story of the school.
It mentions that it opened in 1971. Shortly thereafter there was a desegregation order that came down that affected Dallas ISD. The video lists three schools, Crozier Tech High School, Madison High School, and Lincoln High School that would be closed and/or repurposed, with some of the students from those schools being redirected to Skyline. It doesn't say when these closures occurred.
Seeing as how I don't see a photo of P.A. from the 71-72 school year, it may be worth checking the 72 yearbooks from those three high schools to see if she attended there for her freshman year.
The video also interviews a 1975 alum and gives his name. The host/narrator of the video is also a seventies era Skyline grad who is a sports radio talk guy. His e-mail is here:
http://www.meridix.com/story.php?storyid=14548
At the end of the video it gives an e-mail address for the Skyline Alumni Association as well, so that may be another avenue to pursue.
Lots of old photos in the video if anyone wants to see if they can spot here there but I watched it twice and didn't see her.
Video here: [video=youtube;cFhGnNvmbYs]https://www.youtube.com/watch?v=cFhGnNvmbYs[/video]