Okay, so we've spoken to Tenebria offline now. She showed up outside our house, so we opened the window and told her to go away. The following conversation ensued.
T: And what if I don't want to?
V: Do it anyway?
T: Eh. I'm here, can't be bothered leaving.
V: You aren't going to learn anything new, you know. You're just standing around watching us- if you're trying to creep us out it's not working.
T: That wasn't my intention. I was told to observe. So I did. I am awaiting further orders.
V: ...You don't have to do this, you know. If you leave us alone we'll leave you alone.
T: Don't try to bargain with me, honey, it's not going to work. I obey my orders. I'm not Two Face, I'm not a sentimental fool. I know who's side I'm on.
V: Your father's?
T: Oh ha ha. Very clever. Who is Minecraft Creeper?
V: Read the blogs.
T: ...I must have missed some. There are too many...I have to go.
V: One more thing.
V: Tell your dad I said hi.
T: Very funny. *she vanishes*
Okay, so it looks like we aren't getting a Heel Face Turn out of THAT one. Oh well. I'm slightly worried because she hasn't DONE anything, which makes me wonder when she is.