Board Thread:Skyrim/@comment-108.57.18.192-20140601004116/@comment-71.222.210.5-20140803161000

You can summon her with a console command, ummmmm,  player.placeatme XXX, the xxx is her character code, which depending on your mod load order, the first two digits vary, corresponding to the number of the load order for dawnguard I believe. Her character id can be found here in the wiki.