Not an Obama leftover. National Security Advisor HR McMaster insisted on her as his top Deputy. She came from Goldman-Sachs and from the GW Bush Administration before that.
I've not been liking much about what I've heard about McMaster, especially his seemingly antisemitic slant. That would tie in with his sending his minion Powell to such an event. Maybe both he and Powell should hit the road and we get some better people to replace them.