While in the pilot it is established that a single witch can not go back in time, Sabrina is shown in this episode to easily go back through the use of the Lost in Time clock.
However, the Lost in Time clock is never established as being powered by witch craft, and instead is just a magical item with it's own rules.
However, the Lost in Time clock is never established as being powered by witch craft, and instead is just a magical item with it's own rules.