Well she guided a car and flipped it over, and she made her entire house crumble when her mom was killing her. I would say that her TK strength level would be enough to seriously hurt if not dismember Harry.
And I guess the end of the movie suggests that she could still do shit even if Harry petrified her.
Yeah you gotta wonder which spell Harry would be able to cast in time to stop the assault of many flying knives or simply being made to burst into flame.
Telekinetic attacks with no warning verbal (spell casting) warning or any telegraphing giveaways would be f***ing hard to anticipate, let alone avoid.
Harry would be doomed.
Well, there are blocking spells.
But it boils down to whether or not Carrie is in rage mode or not. If it's just an average day and she is working in the garden, Harry can maybe slip in a death spell. If it's at the prom and she just had blood dumped on her and everyone is laughing at her, dude, even Dark Phoenix better watch out.
I'd still hit it though.