Find my Iphone
My daughter lost her iPhone how can I find it from my iPhone
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Unless she had Settings > id > iCloud > Find My iPhone enabled on it there isn't any way to try and locate it. If she did have it enabled you could try locating it either via http://www.icloud.com on a computer or Find My iPhone app on another iOS device - but that will only work if it's connected to a network.
If she thinks that it was stolen she should report it to the police (to get its serial number : Find the serial number of your Apple product - Apple Support). She should also change her iTunes account password, her email account passwords, and any passwords that she'd stored on websites/emails/notes etc., and contact the carrier.