Kelly Hogan, 51, is behind bars on remand after she allegedly spat on an 18-year-old female worker at McDonalds on March 29.
Police allege she became aggressive and allegedly spat on the teenager and shattered a glass door when her card failed while attempting to pay for her order.
While in custody, police allege the woman claimed she was positive for COVID-19 and then coughed in the face of a male senior constable.
At Campbelltown Local Court on Monday Magistrate George Breton accepted pleas of not guilty to the three charges by Ms Hogan via a legal aid solicitor.
She pleaded not guilty to one count each of common assault, destroy or damage property and not comply with direction in relation to spitting or coughing, COVID-19.
The court heard Ms Hogan could apply for bail next week but would be required to enter a full-time residential rehabilitation program.
Court documents seen by news.com.au describe Ms Hogan and unemployed, homeless, was allegedly in “an intoxicated state” during the incident and “has serious alcohol issues”.
In refusing the accused bail after her arrest, police said the alleged “actions of the accused were disgusting and show a deliberate intent to cause police fear about the spread of COVID-19”.
Magistrate Breton said bail was not applied for and was formally refused and adjourned the matter until next week.