You really have to explore what has made this change. Did the wedding trigger some old fears or concerns that she has from her past. This seems very sudden and sometimes people react differently to being faced with marriage or divorce. She is the only one that can identify what was the trigger. Being defensive does not allow for that discussion to happen. If she has fears that your relationship will become like her last then you have to both find a calm atmosphere and talk about that. She has these fears and she has to share them with you to find a solution. Just talking helps one to hear what those fears sound like and then learn that they are irrational. If you want her to meet you halfway you have to have discussions that promote that. Tell her you are ready to talk and realize that it has to be settled between you. You can't change her but you can get her to feel that you are genuine in resolving this.
If this is helpful press accept