[She still has her weapon up, but there is no sign that she's going to fire on Optimus. Heck she doesn't even seem to tense or change her expression when Optimus draws his own weapon, perhaps she has done this before?

And she tilts her head, her "pupils" narrowing more like the lenses in a camera than anyway a human's would, as if examining the Cybertronian in front of her before she speaks.]

This unit notes that Optimus Prime appears to have a mode similar to that of Earth based land transport, how does Optimus Prime not know what a... G.P.S is?

[It took her a moment to use that short hand there, she's not used to using them.]

If it is Earth then Extraterrestial threats should not be here, if they are then this unit has failed it's mission.