Apple ID and password

Remove Activation Lock on the device.

Follow the onscreen steps to enter the Apple ID and password you used to set up your device or your device passcode.

Learn how to find your Apple ID or reset your Apple ID password.

Remove Activation Lock on the web if a device is offline.

1. Go to www.iCloud.com/find.
2. Sign in with your Apple ID and password.
3. At the top, click All Devices.
4. Select the device that you want to remove from iCloud.
5. Click Remove from Account.

Start a support request.

If you need help removing Activation Lock and have proof of purchase documentation, you can start an Activation Lock support request. 

Hello ~ Is she the original owner with purchase receipt? If so…

How to remove Activation Lock - Apple Support

If this is a second hand device she needs to send it back for a refund or try to get the person she bought it from to unlock it. We cannot help nor can Apple. Take a look here…

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Also:

The All Too Common SAD Reality of Buying a Used iPad/iPhone

~Katana-San~