woman charged with assault after attacking 16-year-old mcdonald 's worker .
amy johnson , 38 , said the fries had fallen out of their containers .
mcdonald 's worker used her hands to put them back in the packet .
johnson ordered new ones and grew angry , going inside the store .
police have said johnson aggressively grabbed the teen around the neck .
she stayed silent through today 's court proceedings and did n't enter a plea .
she spoke outside court saying the teenager called her a ` dog '