It makes me wonder what she's up to, and what she wants. It also reminds me of a quote by Timov, in Bablyon 5: "The secret to the sucess of our relationship is our lack of communication. I would know why you are endangering this."
I'm halfway tempted to try asking her something like "why do you keep talking to me? Usually you just ignore me, so I'm finding this very strange." But somehow, I think that might not be... tactful? Wise? Something like that. Still... All things considered, it's tempting. I mean, what's she going to do? Give me a bad review? Threaten to lay me off? Heh. Yeah, um, go for it. Somehow I don't think asking one's boss why they suddenly decided to be friendly is really cause for firing someone.
I wish she would go back to grunting at me. It wigs me out when she's all friendly.