Just wanted to update everyone that the buns are back together.  After several months of separation, both have decided to put their differences aside and reunite.  With the help of their mommy, who came home for Thanksgiving, they came together and sorted out their differences with the help of a bottle of water and vinegar.  Mommy thought it was pure water until she sprayed Sif with it.  The mixture worked like a charm.  Within 2 days, they were being nice to one another.  I did catch the two of them bumping noses this morning (my virgin eyes!!).  Thanks for all the help and advice!