I agree with you that this is hard to imagine, because 'jolt' is rather an odd verb to use with reference to eye movements.
To 'jolt' is a sudden rough jerking movement which shocks, disturbs or surprises you, for example, if a vehicle has to stop suddenly. It doesn't make a lot of sense for an eye to make a jolting movement.
The usual collocation is 'Her eyes darted back and forth'. 'Dart' is a quick, smooth action, like bird or fish might make, and is more suitable for eye movements.