She set her watch to the time of the Greenwich Observatory (Stratum 1) so it's Stratum 2 time server.
> These are high-precision timekeeping devices such as atomic clocks, GNSS (including GPS) or other radio clocks, or a PTP-synchronized clock.[30] They generate a very accurate pulse per second signal that triggers an interrupt and timestamp on a connected computer. Stratum 0 devices are also known as reference clocks. NTP servers cannot advertise themselves as stratum 0. A stratum field set to 0 in NTP packet indicates an unspecified stratum.[5]:21
* https://en.wikipedia.org/wiki/Network_Time_Protocol#Clock_st...