When the Good turns Bad

Once upon a time, I had a baby girl who slept wonderfully at night.  She would wake up only one time all night to eat.  I want her back.  

It started approximately six weeks ago, for no reason that I can tell.  One night she was sleeping almost all night, and the next she wouldn't go down for the night and wouldn't stay asleep once she did.  For a few nights, we blamed it on teething, and hoped it would end soon.  Six weeks later, it is still happening.  

Since this started, we have transitioned her to her crib in her own room.  She has gotten used to the bedtime routine and now goes to bed easily, but that's where the improvement ends.  In fact, last night she woke up twice in the two and a half hours after going to bed.  And then every two hours after that, all night long.  This is how it goes, night after night after night.  

It seemed that she slept better on days that she did not receive solid foods to eat.  So we quit giving them to her, since she doesn't necessarily need them yet.  It didn't work.  I started feeding her again once a night.  It didn't work.  I'm running out of options, and so far none of them are working.  

Every night we pray for her (and us) to be able to sleep all through the night.  One of these nights it is bound to happen, right?  How can we teach her to stay asleep?  Where is my good sleeper?  If you find her, please return her to me.