I really want to tell her how I feel about the WT and their teachings but I'm not sure if I should. Any suggestions/advice?
Yes, I have some advice. DO NOT TELL HER.
Put yourself in her shoes.
How do you think she'd feel if you were to tell her that you now worship the Devil, AND you hate your parents?
You goal is to empower her to think for herself.
So, what you do is ask questions. She should never know that you have the answers to the questions. The point is not the answers. The point is the heavy mental lifting necessary to fully entertain the questions and their potential answers.
Once a person can think for himself, it's a no-brainer that the WT is a destructive organization.