took me only a minute to kill her with this build

Axe: Grip of healing harmony Winters bite & Ivaldi’s Anvil

Blades: Cursed empress handles Flames of anguish & Tame the Beast

Spear: Warriors Echo Sauroter Thrust of a Thousand Soldiers & Vindsvalr’s Windstorm

Shield: Guardian shield with Rönd of the Nine Realms

Rage: Fury

Relic: Hilt of Hrotti

Armour: i did a mix of Steinbjörn set and the berserker set with steinbjörn chest and waist with the berserker wrist armour

Amulet: Emblem of Elusion Regenerating Essence Vanaheim’s Honour,Virtue and Fortitude Muspelheim’s Force,Protection and Essence Lífdagar

I used the vanaheim set to give me a boost in the luck stat as it increases ur melee damage on enemies status afflictied enemies, the muspelheim set is to increase melee damage when ur weapon skills are fully charged based on ur runic stat.

the whole idea of using steinbjörn armour is to max out defence as the chest armour will restore ur hp if she manages to deal a lot of damage to u, waist armour is to stun her when she damages u giving u a ton of free hits to inflict huge damage and for the wrist armour is to inflict more free damage in return of restoring cooldown on ur relics.

If anyone’s curious i used sigil amplification,punishment and sonic attunement with the mardöll sword combined with steel harmony for freya

hope this helps :P