Only you can determine how much you can handle. But realize as and ACOA, she needs your support and understanding. That's something she hasn't had a lot of in her life. She will have a hard time recognizing and accepting it as loving behavior from you. In time, that will improve. Right now focus on communication. If she is anything like me, she want's you to understand her, but is afraid to open up. It's terrifying to think someone else might actually accept me for who I am.
I've been married for 20 years now. And it hasn't been easy for me, or for my wife. We have has several 'rough patches'. You will have good days, and bad days. You will need to decide if the good days are worth riding through the bad ones. They are for my wife and I. I hope they will be for the two of you as well. Good luck.