to defeat her you need to watch her patterns and use your skills against her. I'd reccomend using the fox transformation against her as the abilities increase in power the more you have at ready.
Using the wolf pelt can also help, as when equipped she add hypnosis points instead of damages you, which if you get lucky and gain the Juggernaut ability, can easily remove the hypnosis points and get back into the fight.
Also try to have some quick attacks too, as they can deal quick damage before she can even move.
Hope this helps!