I don't put my snakes near my face. No reason to. She just seems to try and strike up towards it.
Then there should be no reason to be worried? But as Deborah said, your head is the hottest part so naturally their attention would be drawn there. I can only assume that's why she is striking up.
With as many times as my baby struck up at my face in the beginning I'm pretty confident that yours will also not be able to reach. And if your not shoving your face in hers, your fear is misplaced.