AA doesn't have an official stance, though some sponsors will suggest not diving into anything major before getting the steps under one's belt. There are good reasons for that. Alcoholics are good at the substitution game.
I have never heard it suggested that someone newly sober should withdraw from a relationship unless that relationship is abusive or otherwise harmful. Getting sober is about learning to live life on life's terms, not about ditching responsibilities or commitments because they are distractions to sobriety. The member, not the sponsor, not AA, has to make those kinds of decisions.
Peace & Love,
Sugah