The easiest thing is to keep it disconnected from WiFi. But without knowing some details, it's hard to give helpful advice. What is her level of technical skill?
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How to contact Amazon CS:
Use the HELP link at the bottom of any Amazon page, then NEED MORE HELP...then CONTACT US...and CONTACT US again...select CALL or CHAT. The Call option allows you to input your phone number, and they will call you. Don't use email, and don't Google for a phone number, the results are scam numbers.