The good news is, though, that most of the time SP is deserted (or very nearly deserted) so unless you're camping it at peak-peak hours, it's safer to fly around a bit or even sit on the 4 route point... I know Ponderance swears by sitting in one spot and only one spot (which was definitely good advice in the day), but I only have one account and without snuffling around a bit I'd never have got my Aeonaxx or half my rare pets.
Saw and killed Vyra again last night - funny story, actually. She moseyed over to my Frozen Lake spawn point camping spot, so I flew over to engage and kill, however my game lagged me out and she dismounted me and I died x_x (thank god was only Vyra). It took my game at LEAST a minute to load the graveyard (which was right next to where I'd died) so by the time I'd rezzed she had gone. I flew around a bit trying to track her route but I'd lost her, which really annoyed me because I (selfishly har har) want as few people to have a spawn window idea as possible... I headed back to my Frozen Lake spot to log out for a bit, when I saw her again rockin' up the valley between the lake and that offset vrykul village. So from that I took that she managed to do a loop somehow. Needless to say I relogged after that little experiment, but it's interesting to know that perhaps, even if that was TLPD, there would be a chance you could still get it after a stuff up. Haha.