I was in Markarth and I had to go into the burial chamber or whatever it's called. The lady said I was a person eater (I forgot the name). Am I actually a person eater or is she just saying that?!
This encounter is part of the quest The Taste of Death - Eola is making an assumption about your intentions in entering the hall, but whether or not you're a cannibal depends on how you handle this particular quest. :)
Keep in mind that the reward for this quest,
the Ring of Namira, is a daedric artifact,
and it's missable. There's an achievement
(Oblivion Walker) related to collecting these artifacts.
If you care about such things, you should probably humor her.
From your description it sounds like you've just started the Taste of Death quest and met Eola, in which case she's just saying it and you haven't become a cannibal yet.
You will have the option, should you pursue the quest to become a cannibal or reject them.