Would you talk to your ex after she mistreated you for so long?

Why are you asking strangers about this? No one can tell you what you should talk about, that is down to what the two of you wish to talk about! As to whether or not you should talk to her, that depends on whether you think you can gain anything from it. Be selfish here and think about yourself now, can you get anything positive out of this, i.e. closure? If so then take the chance and do it, if not then don't. She may have blocked you because she wanted the chance to talk to you face to face, she didn't want it being done via the computer. You evidently aren't over here or you wouldn't be on here asking this question, so maybe you should hear what she has to say.