OK, here is the WI/WO method, it is exactly the same for NWs, just remember it is important to distinguish between an angry cry and a genuinely distressed cry. Consistancy is the key, once your dd realises mum isn't giving in and there wont be any co sleeping she will catch on and it is not like you will be deserting her as you will come in to reassure her, it can take time but as your dd used to be a good sleeper then hopefully it will be quick, we have got back on track within 2 WI/WOs before!
WI/WO Method
Follow your bedtime routine being certain that your child has sufficiently wound down from the day. When wind down is completed, lay your child down, tuck them in and use a phrase they can associate with it's sleep time such as "time to go night-night you can find your blankie/pacifier/suck your thumb/etc. to help you fall asleep." Leave the room. Stand outside of your child's door and assess the situation. It's important to distinguish between different types of cries and identify when your child is truly upset and when they may be settling themselves. Remain outside the room if your child is making fussy-type cries or noises. If crying is starting then stopping, hang back and wait. If crying escalates go in to resettle your child. Repeat your phrase "time to go night-night you can find your blankie/pacifier/suck your thumb/etc. to help you fall asleep" and leave again. Comforting should be brief and you should avoid picking up your child.
Upon leaving the room again, wait outside the door and reassess the situation. The amount of time you wait is determined by how your child is reacting inside. The key is to hang back enough to give your child space to fall asleep independently, but to respond to truly upset cries.
