The question of Leia’s relationship to the Force is particularly pertinent following the events of Star Wars: The Last Jedi as the film shows Leia using the Force in an active way for the first time.
There had been no indication previously that Leia had in any way trained to use the Force, or ever used it herself previously.
Of course, there are decades of time that have passed since the events of Star Wars: Return of the Jedi and it’s possible that Leia has learned to use the Force to some degree in that time.
The fact that the scene more or less came from nowhere is one of the most talked about problems that many have with The Last Jedi from a plot perspective.