Lots of good advice. I second the swaddling idea, wearing your baby lots, and generally adjusting your expectations to fit your reality (because what's the alternative, you know? ). The reality is, no one promised mothers great nights of sleep! Quite the opposite. But given that your baby was such a good sleeper, chances are good that she will always be a pretty decent (if not great) sleeper. This may be a fluke - every child has bad nights. Teething can cause lots of bad nights.
When Susan said "Bad sleepers turn into horrible sleepers," she was talking about me. It's really hard, but I'm here as proof that you CAN survive it, and live to tell the tale, and even laugh about it.