Well, it's not the Zero no Tsukaima Louise at any rate, but it is possible her name is also Louise (some day we really should mass edit all the ZnT Louise images to Louise Francoise blah blah Vallythingy). The original image filename is "ruiz" which is probably where the tag came from. There might be some text on the site that clears it up, which means finding the page it was linked from.
Should have checked the tag history - assumed you mean the "louise" tag which is usually used for ZnT (have no familiarity with Gundam whatsoever other than recognising a few characters from all the Newtype spammage).
Oh, and yes, we need to fix the ZnT tags for Louise, she's not the only Louise out there, and the length of her name doesn't mean she gets exempted from the naming rules.