I was able to get into ftp and delete the plugin and the site came back, but my slider plugin disappeared from the server (no I didn’t delete it, too). Once I reinstalled it, the “data” from the plugin was found and the site was totally restored.
At this point, I’m worried about what might have happened. Not sure if it might be easier to have someone else with experience to install this plugin. I’d hate for my client to go down again.