I co-slept with my baby until he was 6 or 7 months old, then we moved him to a cot in our room for like 2 months, and then at 9 months we moved him into his own room.

He was a bad sleeper during the day, but at nights then he was pretty good, i think from memory he would wake once (maybe twice) for a feed and go back to sleep.

It was partly cos when we came to bed we woke him up sometimes, and my DH was getting sick of having to tiptoe around the room etc, so i agreed we could try him in his own room (oh, and my husband has sleep apnoea and snores like anything, which i think affected the quality of my sons sleep).

Basically as soon as he went into his own room his sleep improved out of sight! I was sad not to co-sleep and have him close by, but i think this is what he needed!

But i think we moved him at the right time, before that i think he got comfort from us from being so close, and then around that 9 months stage i think he was ok to move.

Thats just my experience, you can always try it for a week to give it a good chance and move her back if its not working?

Good luck.