I don't know where it would be as you know your house and your mom better than I do. Check drawers, cupboards and boxes throughout the house but look more deeply in her personal areas like her room and anywhere else she uses, like an office. I know that my mom would probably hide mine on a shelf in her closet, between clothing in drawers, or in a night table drawer. You shouldn't have to search too deeply as she just wanted to prevent you from going away, not wipe it off the face of the earth. If you can't find it by tomorrow, I would order one. You can order one and have it come overnight, it'll obviously cost more but it's what I would do if I was in your situation.