That is not D's voice. Nor is it Nara'a's. While the subconscious might process that it's familiar, Gaia's reaction is immediately defensive in nature.

She twists, she raises a hand and quickly attempts to lift and push Ezra telekinetically via the gift of Darkblood. Whether this is going to work on a spiritual form, especially one so intermittently present as Ezra's is debatable.

Thankfully it's not backed up by her native skillset, which is far more effective even on the noncorporeal.

Clearly she is a little bit startled to have a visitor suddenly appear in her home. In fairness, given Trench's nature her reaction is very reasonable; and probably tame in comparison to a strike-first-ask-later mentality.

It does occur after she strikes that the manifestation called her by name. But wait that's not necessarily a good thing. Still the confusion gives her pause even while she's standing up with the intention take a less vulnerable stance.

"Ezra?" That nice fellow that she's spoken to on the Omni a couple of times? Concern over an intruder wars with the memory of friendly conversation. Well, if he didn't mean any harm hopefully her impulsive use of telekinesis didn't affect him that much.