I think it's great that you are going to go to Alanon. I also think it's great she is getting support be that online, meetings, whatever.
I myself did a 12 step for Codependency. It was an amazing journey. I sort of got stuck on step 4 because I was really dreading it. For myself, it changed me in that I became very quick to admit my faults and very open about things in the effort to not hurt others or myself in the future. I became much more quick to say I am sorry and to own up to my own behavior. This is necessary as in my own life, I go through step 4 over and over because I want to keep that slate clean.