Owners of a Canberra business who employ people with an intellectual disability have not let the theft of their till stop them from returning to trading.

Krofne operates donut stalls around Canberra including at Gungahlin Marketplace, where they were robbed on Thursday morning.

Owner Danijela Vrkic said her husband was in the middle of setting up when thieves stole the till and other goods from the car.

"[I was] absolutely horrified, I was actually in a meeting … and I was notified after," she said.

"Gobsmacked is the only word I can say.

"It's something I couldn't fathom — we're out here trying to do good in the community and somebody does this and it really hurts."

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On Friday afternoon, police arrested a 22-year-old woman and a 15-year-old girl over the theft.

"This was an opportunistic crime, but also an incredibly callous one given the important role this business plays with vulnerable members of the ACT community," Detective Station Sergeant Rod Anderson said.

The woman appeared briefly in the ACT Magistrates Court, where she was charged with theft, before being released on bail.

A 15-year-old girl also faced court, but was remanded in custody after the magistrate described her criminal record as "appalling".

Business began to support son with Down Syndrome

Ms Vrkic and her husband set up Krofne in 2016 as a way to make sure her son, Anthony, who has Down Syndrome, had employment opportunities when he finished school.

"He is actually graduating this year and he's then going to be joining us next year, hopefully fulltime, in the business," she said.

"It is about showing people in the community that everybody can absolutely contribute in some way, shape or form."

Ms Vrkic said the theft meant they could not sell $1,500 worth of stock and had to send staff home.

"We're an employer of people with intellectual disabilities and had to send them home, which was absolutely devastating for them.

"It was devastating for our staff, and not only that we actually lost a lot of money."

Maria, Harley, Anthony and Danijela were back at the stall this morning, ready to serve up their delicious donuts. ( ABC News: Elise Fantin )

While the theft has been reported to police, Ms Vrkic had a message for the thieves:

"You have affected so many people," she said.

"We would really appreciate if you could come back with the contents of that till.

"We are a very small business and we try and do the best for the community."