that is the complete truth. a half awakened army would not be enough to defeat riful, let alone priscilla. just read the manga. and in a year or two, we should see some major plot development. (remember, it comes out monthly, but has twice the volume that weekly jump chapters have.)According to the manga, there is no way that Clare is any match for Priscilla in the state she is in in the anime.
You should read the manga, the story line is much better, and in 2 months the main story will pick back up.