The Schirmer test tests for tear production and dry eye, which in her case, was normal. Not sure if Pannus is different altogether or related.
Found this, http://www.royalair.org/pannus.htm
"The diagnosis of pannus is almost always made based upon the clinical history and the appearance of the eye. Your veterinarian will usually perform a complete eye exam that includes:
* Schirmer tear test to rule out tear deficiency (dry eye)
* Fluorescein staining to look for ulceration of the cornea
* Thorough examination of the eyelids and adjacent structures of the eye"
With that said, I do not believe she has Pannus.