Meet with her sponsor? NOPE NOPE NOPE
Sounds to me like the rest of the family needs to go to Al-Anon or get some one on one therapy with an addiction therapist.
Meeting with the sponsor 'reeks' of still trying to control the A. Won't work. And any sponsor worth their salt WILL NOT meet with the family to discuss the A.
I haven't and I won't and I have been sponsoring for a long time now.
I do believe you, and the family need to need your own program of healing. Yes, she has hurt many. If and when she makes amends is on her, not y'all.
J M H O
I hope you and the rest of the family can get some 'healing' for yourselves.
Please keep posting and let us know how YOU are doing as we do care very much.
Love and hugs,