I obviously don't have any experience with this myself as my little tike is only a few months, however on Opera a few weeks ago they had a couple with a similar problem, their 9 month old would not go to sleep and would wake during teh night and call for them. Anyway Opera sent them the sleep lady who recommended the following:
First 3 nights: Mum to sit next to the cot (ALL night) to help baby go sleep on its own and so anytime baby would wake she would be there.
4th night: pull chair away from cot (eg: middle of room) and sleep there
5th, 6th night: pull chair to door (and sleep there)
all though the night, if the baby woke she was not allowed to go to the baby but was allowed to say "its OK, go back to sleep" or whatever.

I think by the 7th night she was allowed to go back to her own room and the baby self settled and did not wake her during the night.

Now I'm not sure if this will help? But it seemed a way to ensure mimimal tears for a change in routine?

Good luck!