needle arrows. Take 2 bows and many, many arrows if you want to kill her with ranged.
if you plan to melee, you won't need so much, take bow and 2 stacks of arrows.
silver shield should be upgraded to max.
your armor is low and if you melee she will hurt you badly. You should be in all wolf upgraded armor. fenris and troll armor have very low armor values, even iron set was better. Fenris is only useful if using the associated fist weapons not an iron mace.

Basically you have set yourself up armor wise to do a ranged kill, so 2 bows and 4-5 stacks of needle arrows are your go-to, and then its just bob&weave while shooting.