I don't think she actually has 94.5% immunity to Energy weapons. I'm pretty sure that's a misunderstanding of the "Mirrored" flag, which protects against Lasers, specifically. Unless you're actually seeing that in-game?
Ranged: She has a weakness to Freezing, so the
Cryolizer might be decent.
Melee: If you have good Physique*, the
Lightning Rod works fairly well.
*Aren't relying solely on Charge Weapon bonus damage