Or does she want me to act concerned
I don't have a ton of wisdom in this area here, and I know you are getting feedback from many who have experienced much more than I have, but as far as you "acting" concerned...
I don't want my husband to ACT anything....I want the feelings to be genuine and sincere. I have found that in alcoholic relationships it is anything but genuine or sincere. So maybe enough with the "acting".
IMHO- what you can do is love her now, truly just love her. It's her choice if she wants to continue the relationship.
And if you are doing the best you can, honestly can, then it's your choice if you want to continue the relationship or not as well. It's not a one way street for either of you.