Everyone makes mistakes, no matter what kind they are. Maybe she did. Maybe she was like that when she was younger.
But ask yourself one thing: is it how she is now? And who do you love, the one she was or the one she is?
People change, and most of the time they try to change for the best. If that's what she did and she went through hardships for it (changing one's behaviour is not a light thing), you don't want to remind her what she was.
The past is the past. Enjoy the present, prepare for the future, don't let the past hold you back.