I'm ignorant of these things, but I've always assumed the worst place to be is outside next to a multi-story office building as the glass windows and facade fall off and shatter on the pavement. In other words, move toward the exit and be ready to go, but don't exit until things quit falling outside or something inside (like a fire) becomes even more threatening than outside.

Part of my advice will be to keep it all in a small/mini backpack since she might need to hike a few miles to get to an open road, to keep the kit together, and for a quick grab & go.