Wikipedia says that she was in a relationship with her business partner up until Theranos fell apart.

She then married her current spouse.

"Baby daddy" is often used to imply that the woman is not really attracted or attached to the man who fathered a child.

I think OP is implying that Holmes hooked up with and married the new guy as a cynical ploy to get a war chest for the impending legal actions.

I can't speak at all to Holmes' motivations, but it certainly doesn't conflict with what I read on Wikipedia, or with her apparent ethics.