Wi-Fi spy

Someone that checks how long you're on the internet and what you do on there.
(e.g. Your Mom)

Person A: Learned something new about my mom today.
Person B: What?
Person A: She looks at everything I do on the internet.
Person B: How do you know?
Person A: I got into a flame war, and she scolded me because of it.
I never showed her my phone, so the only way she could've known is by checking on my search history.
Person B: So she's a Wi-Fi spy.