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Tell her to check her web browser's autofill entries, or use Apple's iForgot service, or contact their Account Security team, or if she's the iPad's original owner and has encountered the activation lock, click here and submit an unlock request.

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You will need to restore the iPad using a computer. The process will erase the device. Later you can restore your data from a recent back-up. Instructions here…

If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support

You are right! I did not see the Apple ID part and thought it was Passcode. Please excuse my lapse...