Ok, so I looked in the astronaut complex and the "lost" section was empty. But there she was under "available". So I am guessing it was juts a glitch somehow? It wasn't a reverted flight because she was orbiting for a few times that I played and quit. I am in career mode and I do not have an upgraded tracking station. I am still in the very beginning and have not even attempted a trip to the Mun yet. The orbit around the Sun was just me being bored and just blasting a ship as far as I could. I did try to "fly" her ship once before I lost her and it wouldn't load (my PC is not a gaming PC), so it may have just freaked out from the partial load?
Thank you for all your help though, you certainly have made my future launches more productive!