Google XML Sitemaps fatal error

I installed the Google XML Sitemaps plugin on my friend’s WordPress website, and when I activated it, I got this error message:

Fatal error: include_once() [function.include-once]: Cannot redeclare class googlesitemapgeneratorloader in /home/content/79/11278079/html/wp-settings.php on line 215

This error message is showing up on the front end of her website, as well as on every tab I click on in the admin panel. Sometimes, the error message is this one:

Fatal error: Cannot redeclare class GoogleSitemapGeneratorLoader in /home/content/79/11278079/html/wp-content/plugins/google-xml-sitemaps-v3-for-qtranslate/sitemap.php on line 43

Could there be some kind of clash between the Google XML Sitemaps plugin and the q Translate plugin she has installed on her site?

I can’t even access anything on her admin panel so I don’t know how to fix it. Also, I’m just guessing she’s using 4.4.1 because there is a message at the top of her screen that’s asking her to update to 4.4.2. At any rate there is no functionality in her admin panel whatsoever, except on the Add Plugins page.