Well she could have been someplace where she couldn't really talk. She may just have answered, expecting to hear you'd succeeded. I would have been on the writing or emailing side, not calling. If there is a way for you to write, I would do so, explaining how you are trying to rebuild burnt bridges, such as with your son etc. Not in great detail, but enough to show her that who you are now is not who you were then. Then leave it up to her.