Locked Apple ID

Is she is seeing activation lock?

See If you forgot the answers to your Apple ID security questions https://support.apple.com/en-us/HT201485

Given that she cannot answer her security questions successfully, see: 

Security and your Apple ID https://support.apple.com/en-us/HT201303

This document says “without proof of your identity via security questions and other carefully selected criteria, Apple Support can't help you reset a password or perform any other actions on your account.”

Thus, we can do nothing to help her here, except to mention that "official" Apple support might help her if she has extenuating circumstances (e.g., she has the receipt for her purchase of the device with its serial number on it or a court order instructing Apple to assist in the provision of access to a decedent’s information from the deceased person's accounts). if she wants to contact Apple support to discuss such circumstances, see these support options:

Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

Apple ID Support https://support.apple.com/apple-id

Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option. 

Apple ID Has Been Disabled

1. If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled
2. If your Apple ID is locked or disabled - Apple Support
3. If you see a message that says 'Your account has been disabled in the App Store and iTunes' - Apple …
4. Apple ID is Disabled - Apple Club
5. Apple ID- "This Apple ID has been disabled for security reasons" alert appears

Contact iTunes Support using this form or scroll to the bottom of this page and follow the screens until you find a chat and/or telephone option.  Pick any problem to select an option.  

Reset Security Questions

Contact Apple for help with Apple ID account security

If you forgot the answers to your Apple ID security questions - Apple Support

You may need to reach Apple’s Account Security department. If you cannot find your country or are not able to call, then complete this form and send it to them.

Try using Apple's iForgot service. If it says they don't have sufficient information, you need to contact Apple's Account Security team. To reach them, click here and pick a method; if you can't use any of the ones listed, fill out and submit this form.