website down after updating Smush

I updated the WP Smush Pro plug-in yesterday and something went very wrong. The website is completely down and all I can see is this message:
Fatal error: Cannot redeclare get_plugin_dir() (previously declared in /home/gentntvn/public_html/wp-content/plugins/wp-smush-pro/wp-smush.php:128) in /home/gentntvn/public_html/wp-content/plugins/wp-smushit/wp-smush.php on line 120

My client really needs her website back up and I cannot even log in to the site to try to figure out what's wrong. Which means I can't get in there to grant you access, either.