Will an AntiVirus program be enough to protect me on a shared Wi-Fi network like Starbucks?

Public Wi-Fi hotspots aren't as much as an issue with viruses, but there are other concerns. Her computer is wide open for anyone to snoop into. Her passwords could also be grabbed if the online email service she's using doesn't encrypt. A good, safe way is to use a Virtual Private Network (VPN) like Public VPN.