As far as her attending the meeting. It's about trust.
I hate to break it to you, but a family member taking a job away from someone else is not the definition of nepotism. Nepotism is the practice among those with power of favoring relatives, especially giving them jobs. Nepotism is favoritism, preferential treatment, bias and partiality. What President Trump is doing with regard to Jared and Ivanka is classic nepotism. It causes serious problems in any workplace other than family owned/run businesses.