Thanks all.
If i leave her, and i have a lot, she screams blue murder for 2.5 hours every time and then finally settles for a few hours only to do it again.
I just can't leave her any more as i really find it hard and it obviously hasn't worked as she is still waking.
So i'm now very tired and bringing her in seems to settle her straight away and i get sleep. So i think i'll just let her grow out of it.
She does settle her self when she wakes up earlier in the night it's just if she wakes after 3am she seems to want us.
Thanks for all the comments, really helpful