There are three basic directions — up-and-down, side-to-side, and circles (diagonals are variations of these). Try A, then try B, and watch which one her body responds to. If you can't tell which, ask — her answer beats any guess. When something clearly works, stop switching randomly: thrashing between moves, speeding up suddenly, or changing everything at once is how you lose it again.
The nuance: keep the same motion when it's genuinely working — especially as she gets close to climax — but vary direction, pressure, and rhythm most of the rest of the time. And these three directions are a starting grid, not the whole space: touching through the labia or hood and broader coverage have their own deep-dive guides (see related reading).