What happened when Nikki went to get an entry form for the school art show dork diaries?

When Nikki went to get an entry form for the school art show in the book "Dork Diaries," she accidentally stumbled upon her arch-nemesis, Mackenzie, also picking up an entry form. This led to a heated exchange between the two, with Mackenzie making a snarky comment about Nikki's art skills. Despite this encounter, Nikki remained determined to showcase her talents in the art show.