A2 knows she's been followed, but she doesn't really think anything of it. She looks weirder than the humans there, so if it's because one of them wants to subtly ask her what's up with her, A2 doesn't actually mind.

Or, she doesn't until she pulls the jumper off over her head, and turns to face her stalker, scowl still permanently etched into her face.

Can I help you with something? Is what she signs, motions fluid from downloaded data.