Boyd’s Bible Dictionary:
(vigilant). A Moabitess, mother of Jehozabad, one of the murderers of King Joash (2 Chron. 24:26). Called Shomer (2 Kings 12:21).
Potts’ Bible Proper Names:
Keepings; watchings; female guard:―mother of Jehozabad [SHIMRI], 2 Chron. 24:26. {Custodiae}