Halacha – a Rov and only a Rov
If the matter is of a sensitive nature, I don’t think for one minute that the fact that a woman is married to a Rov necessarily endows her with special powers that make her a logical choice to turn to. I would seek out a woman whose judgment I respect, or a professional who deals with such issues.
I am more comfortable speaking with women, so I would probably talk to a ftum female Social Worker or the like. That does not mean that the rebbetzin would NOT have good advice, but being a rebbetzin is no guarantee that she knows what she is talking about. I am also not sure I would want a local rebbetzin knowing my personal business.