Granite (http://tanbrown.org) still absorbing

My sister-in-law hired a professional to seal her newly-stalled Desert Sand (http://maplered.com) Granite (http://tanbrown.org) bathroom Counter (http://GialloFiorito.com) . (She had previously tried to seal it herself but without success, so this was the second coat of sealer applied.)

Before that professional left her house, he showed her that it was sealed by sprinkling water on the Counter (http://GialloFiorito.com) , which beaded up. The next day, however, the Counter (http://GialloFiorito.com) was absorbing water and (http://maplered.com) darkening again.

What can my SIL do to effectively seal this Counter (http://GialloFiorito.com) ? And what test can she do to make sure that it is properly sealed? Thanks for your help.