I'm afraid once off there's no way to track.... if she lost it at home.. search in the most unimaginable places.. one time I lost a phone a whole year.. it got packed in christmas ornaments box :P ..
look under the couch.. in jackets pockets.. in drawers.. under the bed.. under the car seat..
did your mom notice early when she lost it?.. was she at home?..
in case you don't find it.. or is not that big of a deal.. call the mobile company to report it.. that way you can get back your number on another phone..that way you don't lose it.. but all the other info: contacts, pics, etc they'll be gone for good.. until and unless you do find it later on..
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