Because of your instant shots and cassies not-so-fast flying arrows, you can win the "peak and shoot" game against her with ease.

Try to sneak past her, and then take her out easily, but if you 1 v 1 her, it all depends on skill. Don't be predictable, try to bait her arrow + blast combo with Reversal, and use Nether Step as a way of dodging shots, be fast and accurate