That's not a "driveby download". She deliberately downloaded something, on purpose - it just wasn't quite what she naively imagined it to be.
A "driveby download" is where you visit a web page, click on nothing, download nothing, and still get infected.
Personally I treated this as a people problem needing a people problem, not as a technical problem needing a technical solution. My children have now been trained out of downloading nasties, certainly onto my network; this is a one-off permanent fix, so I no longer have to worry about anti-virus stuff and other ways of fighting malware.