Kristieann Marie Kelp, 42, of Landmann Street, Warrnambool, pleaded guilty in the Warrnambool Magistrates Court to drink driving while being in charge of a vehicle.

She was convicted and fined $500 with $79.50 costs.

Magistrate Ross Maxted said Kelp was in a position of significant responsibility with her child in the back seat of the car and instructing a learner driver.

He said trust had been placed in Kelp.

Police said that at 5.15pm on July 4 Warrnambool highway patrol unit officers intercepted a car in Warrnambool's Glenrowe Avenue and did a licence check on a learner driver.

Kelp was in the front passenger seat as an accompanying driver and tested positive to alcohol and later in an evidentiary test blew .088.

She said she had a shot of alcohol only minutes before being driven from a Whilehead Court address.

Kelp said it was a silly thing to do but her car had been trapped at a Whitehead Court address while delivering food and an altercation had occurred between other people at that time. 

She said ambulance and police officers were called.

Kelp said she was teaching the learner driver how to do the food drop-offs.

She said the child in the back seat was her son, who suffers from cancer and goes everywhere with her.

Kelp said a resident gave her the shot of alcohol due to the stressful situation she found herself in. 

She said she also cooked community lunches and was a carer for her two sons.

It was her second drink driving offence and she also failed to appear in court during August.