Aside from being groomed to accept it, a couple other possible reasons for her behavior may be that:
she realizes - or has been schooled in - the importance and value of the "optics" of a senator and now, a (p)resident, having a "happy, loving and supportive family" and/or
if she's benefitting in any way from the Buyden family grifting, Joe's "sins of the past" may be easier to try to ignore/forget/bury
Aside from being groomed to accept it, a couple other possible reasons for her behavior may be that:
she realizes - or has been schooled in - the importance and value of the "optics" of a senator and now, a (p)resident, having a "happy, loving and supportive family" and/or
if she's benefitting in any way from the Buyden family grifting, Joe's "sins of the past" may be easier to try to ignore/forget/bury