He has a point, but she's not sure Palpatine won't just tear his way through what's left of the Resistance regardless of whether or not she's still a part of it. They'd been in hiding for the better part of a year, and thus far it seemed to have worked, but they couldn't hide if Palpatine was finally making his move to reclaim the power he'd lost. Not without sacrificing more of the galaxy to him.

"Then...it's an option, I suppose. Leia won't want to lose me, but the Resistance will be safer if he's looking for me instead."

They could leak the information that she'd disappeared. And Kylo could perhaps turn the First Order to another path if he stayed in command. It's not what she wants for him, but even she sees the value of retaining what control he has there if they're going to have to face her grandfather.