At that point in the story it's unclear what's in it or how it's protecting you, I don't think that would have been the best route. The... occupant doesn't know her from a hole in the ground unless you ask it to, much further into Act 2. And knowing her,
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even if you could have removed the scales from her eyes in Act 1, she'd probably still encourage you to wipe out the Grove so as not to tip off the Absolute.
Even in Act 2, when you can finally extend the Prism's protection to her, she has to either hide in your camp or pretend to be a mindless thrall under your control to keep the ruse going.