I woke up this morning thinking about this and I still think the best course is to stay out of it. Either she knows or she's been told a story where DH was pushed out by the evil partners (most likely with the help of DBF...). In the latter story, if you step in, you become one more in the team of evil DH wrong doers. I think it's better to preserve your work relation and be there if she needs you down the line.