Crenna Earth-Daughter being a dope?

I realize that Crenna’s constant jumping around instead of running makes her a lot more “lifelike”, but twice now I’ve fought Khajin the Unyielding in Halls of Infusion (in Follower mode) only to have her die because instead of standing still behind an ice boulder, she insists on jumping around and getting into the path of the blast.

Bad enough with a DPS but with the healer this is pretty bad. Can this be improved?