Even if my view of the one who walked out on me is too narrow, as you say, it is the truth. Why play games with a fantasy of who she might become?
Seeing her as more than the behaviors of walking out on you is not fantasy. I think it is a higher reality than seeing her only in terms of current behavior. As I said earlier to you, would you want all of your family members to define you exclusively by the times when you had a really bad day, with insensitivity to some family members? Do you think this misbehavior is the exclusive truth about who you are as a person?