I mean... outside the outpouring of emotion and the specific words that she said in the conversation... how certain do you feel about her sincerity to DO THE WORK necessary to allow the two of you a fresh start?
If there are any "signs" to look for... they would be her making effort to connect with you... and anything you might notice of things that show she is being someone you might want to be with...
Regardless of if they were with your X whom you felt terribly hurt by... or anyone else whom you had no history with...
That she is someone that you would want to be with...