This thing is a real pushover. It may look imposing enough, but once you've gotten into the swing of attacking, its just repeat until dead. You essentially want to draw here into a corner and start pummling her. After about mid HP, she'll try to summon monsters. This can be stopped of course which gives you more damage output. She'll keep doing this for a long time with the occasional attack. Eventually at low HP she'll try to use a more powerful ability, but if your close enough, it won't so much as scratch you. More damage!