Here is something to remember: actions speak louder than words. Sometimes they tune us out and do not hear the entire sentence and then they pick and choose what they want to hear and accept. So, instead of having talks, show her how much you have changed and that you are having fun. If you are doing something that may interest her, there is no harm in inviting her to come along. If she says yes, then treat her as a roommate with no expectations. If she says no, accept the answer and go ahead do whatever you have planned to do. It will be her loss, not yours.