i'd hold out on the 3rd party communication on personal phone until we know more about how standard that practice is, whether the prior director used similar communication under trump, etc.
the person questioning her likely isn't versed on the SS handbook.
on the surface though it's not a great look.
of course, as i've said, there's a decent chance the executive branch that this rolls up under will be headed by the target of the assassination attempt. if nothing happens under him, we'll know there's nothing more there............