I bet she got promoted or if already GS-15 reassigned to same grade out of the spotlight.
I would bet she’s a Schedule C political appointee.
https://en.wikipedia.org/wiki/Schedule_C_appointment#:~:text=Schedule%20C%20is%20the%20third%20of%20five%20excepted,or%20practical%20to%20use%20traditional%20competitive%20hiring%20procedures.