Thank you for your question and reaching out. I can understand you are having query\issues related to Internet Usage.
Please note that TP-Link is just router or Device to provide Internet on your computers from ISP , they are also Public in some type.
Please use Strong password on your TP-Link router Admin page and WIFI access profile
Also , Switch Off Router during Night time or when its not used.
Please inform her to Install and Use latest Antivirus software and keep it updated.
Protect your Microsoft or any other accounts using MFA.
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