This very question brings up an issue that is commonly encountered by LASIK surgeons, which is the late enhancement request. Sometimes, patients after doing well for a number of years develop residual refractive error and request retreatment. This theoretically can be done by repeat LASIK with the same flap, cutting a new flap, or by a surface PRK type of treatment. Each of these procedures can have additional risks not present at the time of theoriginal procedure. The repeat LASIK with the same flap may have technical difficulties lifting the flap, or an increased chance of epithelial ingrowth at the edges of the flap. Cutting a new flap can have its own issues, and a surface treatment can be unpredictable and has an increased risk of haze formation. There can also be microstraie created in the flap.
Before even considering the retreatment though, one must ascertain why the vision has changed in the particular case. Is there some cataract formation? Is there some instability of the cornea? Or is this simply a residual refractive error that now needs to be resolved.
I mention all of these things to point out that there is no simple answer that can be given in this type of a forum. Fortunately, it has only been two weeks, and the healing may not be complete so there is a good chance that the vision will improve. She should stay in close contact with the doctor, be sure that the vision is making progress, and ask for a specific reason if the vision does not improve within the next few weeks. If the vision is correctable with glasses that is a very good sign.