Jackie, trust me. If she did it once, she can do it again. Are you still feeding her when she wakes up at night? I'd say stop. Make sure she has a nice comforting bedtime routine (bath, pj's song, story, whatever works for you) so that she knows it's bedtime. Then, if she wakes up at night, give her 2, 3, 5, 10 minutes (however long you can take) before going to her. And when you do, DO NOT pick her up. Give her a pacifier, or something else she's comforted by, and tell her "everything's alright, it's still sleeping time" and then leave her alone. Or, if you really think she should be feeding at night, make sure you keep all the lights off and do not react to her cuteness. You can hug her and hold her, but make sure her night feedings have a significantly different feel from her daytime ones. That'll help her know the difference a little better.You're a great mommy, and you may already be doing all this, so I'l preaching to the choir :-) This is what worked in my experience. Good luck!
Lame! I'm sure she'll do it again soon. :) We all end up sleeping through the night eventually. . . .
I bet she would have slept through the night again, but she felt bad for worrying you the night before.