My mom just told me that she reset her iPhone, and has all the pictures and messages that are on my phone now. How is this possible?

My mom just told me that she reset her iPhone, and has all the pictures and messages that are on my phone now. How is this possible?

Are you using the same account?

That happens when you use the same iTunes account and she used one of your iCloud backups to restore her phone.

She used your sign in because she probably never had her own

I suppose that would be possible if you'll share an Apple ID.