Personally, I would find the crying associated with going from BFing back to sleep straight to WIWO too much. But everyone is different, and it really depends on your LO.
If it were me, I would probably start with a bit more of a gradual approach - i.e. do you have a DH or partner who could try to cuddle back to sleep for a few days to break the BFing association, and then maybe move from cuddling to sleep, to just soothing in the cot, to moving a bit further away, and then maybe WIWO once she's closer to independent sleep?