So after I returned her to the castle and I chose vampire btw I try talking to her so she can follow me no dialogue pop up please help I want her to be my follower

for pc by the way

Wrong place mate read the title this is The ELder Scrolls Online forums not Skyrim Forums

If you're at the point in the quests I think you are, she temporarily stops being a follower at this point. You will see her again, don't worry.

sorry about I'll be more careful and read

Welcome to the forums.

As said above, she will join you again.