It sounds to me like she's blowing off steam , why not let her .. you don't have to act or fix anything , just listen and be present .
Keep on with your sober plan and try and keep your serenity ..
Maybe plan in some kind of pampering session for her or write her a letter telling you lover her and her support is great ..
When i was an active alcoholic i hurt everyone close to me and myself , drove them away .
Keep on , things will change for the better even though it's painful getting there sometimes .
Bestwishes, m