I don't know what the Apple world clock looks like, but since she has
a Samsung Galaxy tablet, it probably has the same world clock as my
Samsung Galaxy A51 phone.
Just tap on the clock on the home screen and it will probably give you
a page with Alarm, World clock, Stopwatch and Timer. You can set several
clocks and set the order you like (by selecting a clock and the dragging
it up or down). Currently I have some eight clocks.