Last night while roaming around the courtyard, yet to enter into the ruined tower, I checked in the east and north towers. North first, then the east... Finally realizing after entering the ruined tower that Serena was no longer following me. Finally locating her back in the North tower, I attempted to exit the tower again while she was following me but she would not enter back into the courtyard. Obviously at this point, she wont wait or leave your services. Next, I tried to attack her, she still did not follow out of the tower. Then I tried turning xbox off and reloading my earliest save (unfortunately she was already in tower though), and that didnt work either. Havent seen any info on resolving this issue. I also tried to walk all the way back out of the castle but the drawbridge (the one that lead to the first encounter with a gargoyle) had raised back up and I couldnt exit... Maybe there is a chain to pull, havent looked thoroughly for that just yet. The main concern is Serena not following. Any Info?

Some additional info.... There is a chest in the north tower that I cant access because I believe whirlwind sprint is needed to reach it. However, I dont have it just yet (crazy i know). Also, upon entering back into the north tower and east tower (since Serena has been stuck) the other chests in the North tower are refilled and the east tower gold and necklace found on the steps had also returned. Not sure if this is a bug that is related to Serena being stuck or not.