"I asked her if she felt like I restricted her and she said no." - YES YOU DO DID - to ask a women a question is to answer it. She spared your feelings on this one.
"She is VERY clingy to me, or atleast was, and I am sure she has caused some of the problem herself. She restricts herself to me." - she's growoing up and you lowered her interest level - no women will cling to you if she is not interested.