Studying for the MPRE right now and listening to the Barbri lecture over judicial ethics. The lecturer said, "A judge MUST disqualify him or herself where their impartiality could reasonably be questioned, unless parties remit." Applications for this: personal bias, prior involvement in case, when former partner or close relative is a party attorney or witness in proceeding, economic interests in case, public statements by judge that pidgeon hole them into a particular position.
Doesn't sound like the judge would have to recuse herself just because her husband formerly represented a party in the case. I dunno though.