Tom's post in the Solari and Luria Nova realm merger thread states:
A "friendly realm merger" does not require a precise definition of every word. What I intend by those words is that I don't want realm A and realm B to sit together and say "hey, as one realm we would have better game mechanics on our side" or whatever, and then simply join up.
Duchess Khari decided she didn't want to be a part of FR anymore, not the rulers simply agreeing to merge, thus this is not a realm merger.