I wrote a few long responses and still stand by them. You never know for sure someone is telling the truth, but you have to trust she is by her actions. She hasn't left you. She's willing to stay for a year. If you are communicating with her and working to better yourself and make the changes you need to, you won't have any regrets.

Also, I'm coming from the cheating side so I can't really speak for her as I've never been in her position before, just in yours.