After you defeat the Four Kings her armor and catalyst will be in the Valley of Drakes, she has also traversed the abyss making her part of a trio of people to traverse it the others being the chosen undead and Artorias.
Witch Beatrice is sorcery using NPC. You can summon her for two boss fights in the game, The Moonlight Butterfly and The Four King. She can be a great help against the Moonlight Butterfly early on in the game if you challenge this boss, especially if you don't have any weapons capable of attacking the Butterfly while it's in the air. Against the Four King she can help but if you summon her for this fight the Four King become stronger.
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