If you know how to use the console, open it up and type in the following. I don't know if you'll be able to have the friendship in ToB, but it will end the stutter.
CLUAConsole:SetGlobal("I#ViconiaToBTalks","GLOBAL",1)
Then hit enter. If she's in an active stutter at the time, you might have to do this a couple of times, or pause the game, but it should work.
You should also post a link to this topic in the Viconia Friendship bug reports thread here.
Edited by berelinde, 08 March 2010 - 05:14 PM.