I think if Leia had done the hyperdrive ram (as I read was originally the plan), it would have made perfect sense.

Jump too early you ghost through them, too late they stop you with shields/mass/tractor beams. Hitting that sweet spot is next to impossible, not even a droid or computer could do it.

Leia who has run from the force, turned her back to it her whole life, in her last moments reconciles and taps into the force, allowing her to perfectly time hitting the hyperdrive.

Then when Luke dies ascending to the force he travels momentarily back in time as a force ghost to guide Leia the way Ben guided him in a New Hope.