What about taking her lunch today, or something like that? You don't have to tell her that you consider this the first day of your new start, but YOU can think that way. I think she has been making baby steps towards you but you have been missing them because you were too afraid to trust her. (I don't blame you one bit, btw)
Maybe it's time for Blackie to make a baby step towards her?? Whaddya think?