Mixed signals

I don't see exactly what "mixed signals" you're getting here. It looks to me like she's being friendly - which seems to often be mis-construed with the notion that there may be potential to seek something more.

What kind of "teasing" took place?

I mean, maybe you should try something a little LESS passive, here. I mean, no offense, but you're slamming your head against a wall when you shouldn't be. You should mention that no one is around and maybe she'd like to get a cup of coffee with you or something. You can't pansy-ass vault a ball into her court and expect her to hit it back to you when you're so unclear.

Maybe she went home for the weekend, too.

You'll never get anywhere if you don't TRY, man. What are you going to lose. Just ask her if she'd like to get together while everyone is away.

But seriously, I don't see too many mixed signals. I think you may be making a mountain out of an anthill right now.

How ya doing, buddy?