A woman has been refused bail after allegedly stealing items donated to the NSW Rural Fire Service on Christmas Day in Sydney's northwest.

Police will allege Josephine Trusk broke into a Schofields supermarket about 3.40pm yesterday and stole food, SIM cards and a trolley of food and drinks donated to the RFS.

The 37-year-old and a man allegedly kept driving when officers tried to stop them as they left the scene.

Josephine Trusk has been refused bail after allegedly stealing donations meant for RFS volunteers. (Facebook)

Trusk allegedly brioke into Woolworths Schofields store on Christmas Day and stole food and drinks donated for firefighters. (9News)

The car hit a fence shortly after and the couple were arrested on St Albans Road.

Trusk faced Parramatta Bail Court today charged with break, enter and steal, and negligent driving.

She wept as she told the judge it was her male accomplice's idea but the magistratewas not moved.

Josephine Trusk and a male have been refused bail after allegedly stealing donations meant for fire crews. (Facebook)

"At the moment, I can't see how I can safely release you into the community," Justice Daphne Kok said.

Trusk's 48-year-old accomplice is due to front the Blacktown Local Court on February 3 charged with possessing a restricted substance.

Woolworths say they will replace all the stolen items for the Rural Fire Service.