I did the system crysis taught me. It has a different name now. The HV told me that everybody wakes up a few times each night , we all learn to put ourselves back to sleep though. This is what your little minx needs to do.
Have you tried this.
Put her to bed usual bedtime routine.
Then if she doesn't settle (calling for you) or wakes later, go back in. But this time don't reward her for being awake. Don't have I contact, don't talk, don't fuss. Just check there is no reason for her being awake , like a wet nappy, then walk out. Absolutley no Eye contact or patting or talking.
Leave her to cry for 3 minutes.
Then go back in and reapeat, check there is nothing wrong, but don't reward her for being awake, no eye contact minimal touch (check for wrinkles in blanket and out the door. The maximum you should be in the room is 30 seconds at any time.
Then leave her for 5 minutes.
Repeat.
Then leave her for 7 minutes.
Repeat.
Leave her for 11 minutes.
Repeat.
Keep at 11 minutes. Repeat all night if need be. But rarely do you get to a second 11 minute stretch.
Prepare yourself for this before hand. If need to, warn the neighbors that your LO will be crying a lot. Prepare to feel like the cruellest mother in all existance and be sat outside her room with tears running down your face.
It does work, she should be sleeping the night through by the end of the first week, mine took 10 days, but he was SEN.
By staying up with her you are making it a pleasure to be up. You re-inforce it everytime she wakes up, by cuddling, and rocking her. You have to be the boss now or you will never get a decent nights sleep. Your DH has to be in on this as well, he HAS to support you. Just mention that he coukld in all possibility get some nookie if you get some sleep.
Try it, a lot of parents think its cruel and old fashoined, but it does work, and a rested Mum is better for her child than one who would love to strangle her at 3am.