Letting you all know snake lady not easy to beat. After you find her in the regular mountains, and see a blank question mark, that is her. Highly recommend you use Oriana and Kinwa for both damage dealing, and damage reflecting. try to use Anon to use capture on one of the minions, but mostly use Kinwa's ability to make all the projectiles disappear.
Have fun when you get her! She super hot <3