It sounds as though you're being perfectly reasonable.
Just a couple of general thoughts on 'agreeing to disagree'. You may be doing these already, but I'm just offering them in case you're not.
1. make sure hear her out. Even if you don't agree, affirm that you understand why the particular issue bothers her
2. don't tell her that her thoughts are silly etc
3. watch your tone of voice
Are there any issues in particular which remain unresolved?
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.