The idea that anyone can use the force is introduced in A New Hope
That’s still not how the Force works. You don’t go from level one to one hundred in a matter of minutes, especially if you’re Sabine and didn’t really learn anything.
Luke went from struggling with a training droid to guiding a proton torpedo into an exhaust port within one day. Sabine went from sensing Ahsoka’s presence to pushing a guy a few feet within a few days.