The fact that you all are Britney, Pink, Gaga stans or Xtina haters, and are the ones rushing in here speaks volumes.
You can't resist. The desperation and dedication. Not to mention that doesn't sound like '90s material at all. Either you're poorly educated on music history or you're just being a stupid hater.
A.) She isn't straining, that is a sound she chose to use, she could EASILY sing without it, it's for flare or style
B.) She isn't pitchy at all, you really have no clue what you're talking about