I am glad she has said that she would do things differently. For me, when a person admits they were in the wrong it is easy to forgive.

At the same time, if you decide you made the wrong decision, you can always quit. Going back now seems like a good choice, if it ends up being the wrong one it is not irrevocable

That is a long wait. Perhaps you can use it to consider what things you really need her to change and what things you can live with. For me, when getting out of a relationship I tend to get very focused on the bad things, and even things that are no big deal get added to the list. What is vital to your continued growth?