Caroline in season 4 went on and on about the Stefan diet and how Elena should go on it but Caroline isn’t even on the Stefan diet. she drink from blood bags. what do 你 think about this?

Caroline's a hypocrite. Best example: "Someone who does terrible things is just terrible"

Stefan has done terrible things (and so has Damon!Don't freak out on me, Stefan fans), and yet she's best 老友记 with him.

I think that Caroline was just being a friend. In the beginning of season4 Elena couldn't keep anything down,she could just take from the vein because Damon told her to. Caroline drinks from Blood Bags, Elena Tried until Damon 说 it was okay, She was sired to Damon.

I guess she thought it will be good for Elena in ways it wasn't good for her... But she did help her after the diet proved to be not good.