Thousands of desperate Syrian refugees hit headlines last week after they packed into Budapest's main international railway station and were barred from getting on trains to Germany or Austria.
Ms Duckor-Jones put out a message calling for donations on her Facebook page and received almost $10,000.
She was "absolutely blown away", she said.
"It really put my faith back in humanity. We just thought it would be our friends donating $10 or so, I was expecting tops $100. But we got $5000 in the first night.
"It just shows New Zealanders have a big heart."
Ms Duckor-Jones and her friend Ella Kay used the money to buy bag-loads of food, water, clothing and medical supplies and carried them back to the station.
They completely cleared one local store out of bread.
In another, they bought almost all the water bottles on offer.
At a department store, they emptied a whole shelf full of sanitary pads and stocked up on about 80 toothbrushes each day.
One woman had given birth in the station and was clutching her newborn baby when the pair brought her supplies.
Desperate people started mobbing the duo so, another social media call-out later, they formed a group of 10 volunteers.
"We got bags taken off us, ripped off us," she said.
"Obviously we would try and go to the families with women and children, but you're walking through with 10 bags of food and you're going to get mobbed. We were just two girls in a crowd of thousands of refugees."
The volunteers would head to the station about 8am each day for about a week, staying for about six hours until they ran out of supplies, then heading back to plan what to buy for the next day.
Ms Duckor-Jones has since left the city, arriving in Croatia this morning (NZT), and said most of the refugees had been allowed onto trains by Saturday.
She will be donating the leftover funds to grassroots organisations - including Refugees Welcome, Migration Aid and People to People: Helping Refugees in Calais.
"I actually left with a really heavy heart. You can't help but think there's so much more I can do...there's part of me that was like, 'should I follow them to Austria?'.
"I had to keep telling myself that I am on my OE at the same time, but I felt guilty telling myself that.
"One who I felt really guilty about leaving was the woman who gave birth at the train station. She had a newborn baby and she's not even refugee status. There's people like that. It's so hard."
Prime Minister John Key yesterday announced New Zealand would accept 750 Syrian refugees over the next three years, including 600 in an emergency intake, above the usual annual quota of 750.
Aid agencies and political parties have said the increase is a "welcome but overdue" first step.
It was the most New Zealand could cope with, Mr Key said, and it was "already stretching the system".
Ms Duckor-Jones said the increase was a start.
"People will say [the quota] is not enough, but it's something at least.
"There were thousands there and I think we probably only fed, I dont know, maybe a couple of hundred. I know that sounds like a lot but if you were there and saw the crowds of people, it's nothing."
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