My friends phone looses battery real fast what can she do?

it had went to 100%at 7 in the morning to 34% by 8 in the morning

Close all open apps by double-tapping the home button, then swiping up and off the screen with the app window (not the smaller icon).
Reset your device: hold down the home button along with the sleep/wake button until the screen goes black and you see the Apple, then let go. (No data loss)
Battery optimization: http://www.apple.com/batteries/iphone.html

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