while i'm not clear on We have friends/relationships in common, one of which is very principally involved with current emotional turmoil I'm having. exactly what that means, if she's a long timer in the program you are attempting AND you two clearly discuss what is expected re: these other relationships, I don't see any problem
a strong 12 step program usually means that we don't fall into the sick relationship stuff that so many of us suffer from when we get here. As long as her advice isn't partisan toward either party of the turmoil, there's no reason she can't take you through the steps. in fact, if she's had the opportunity over the years of observing your relationships, she might be able to offer clarity that an outsider may miss.
i've know women who've gotten sober when their husbands/lovers continued to drink, i've know spouses who actually came into the program because the other spouse started working a program and they ended up with a strong program AND marriage on the other side.
i don't know anyone who hasn't stayed sober no matter what the circumstance if they really did the work and were willing. the Big Book tells us in "Working with Others"
Job or no job - wife or no wife - we simply do not stop drinking so long as we place dependence upon other people ahead of dependence on God.
Burn the idea into the consciousness of every man that he can get well regardless of anyone. The only condition is that he trust in God and clean house.
So you must ask yourself, are you willing?