From what I have gathered about the combi pill and bf it's only an issue for really new babies and emerging milk supplies....so now that she is 12 months old your milk supply 'should' be ok. Some sites suggest that you can go on the combi pill from when baby is 6 months old, though personally it's not something I'd ever do.
Have you seen what
Kellymom has to say about the combined pill? At the end of the day I guess it is up to you where you go from here. I am a mini pill person, even when not bf because AF goes AWOL and I like that. LOL