She explained that she had been in the library the day before. Her printer is broken, so she came in to use our Print from Anywhere service. It all worked fine, but now when she opens Chrome, our printer page comes up and she can't get rid of it. Previously her browser always opened into her email, and she wanted me to get that back.
She described the page to me, which turned out to be the print confirmation page. And while telling me everything she tried to do to fix "the virus," she kept mentioning she right-clicks to close tabs. I don't use Chrome very often, so I thought she may have accidentally clicked "set this tab as my homepage" or something like that.
While she was talking I opened Chrome to check, but that was not a right-click menu option. However, in the settings, I found Chrome does default to "Continue where I left off" - which means it just opens the printer page because that was the page she was on when she closed her laptop.
After I explained this might be the issue, she was willing to test my theory, but was clearly skeptical that it could be that simple. However, she typed in her email url, close Chrome, reopened it, and sure enough, it worked.
I told her if she unchecked that option, we could force her email to come up every time she opened Chrome, no matter what she was doing before. She made it sound like that sort of wizardry was unnecessary, thanked me for fixing her virus, and hung up.
She really was kind of upset - well, overwhelmed by the arbitrary whims of technology, more like - so I was happy we could get things back to normal for her. Hopefully this doesn't sour her on the library or the Print from Anywhere service. We shall see.