"You wouldn't know anything has happened," she said.
Cobb was holidaying with her husband Bevan and their three children Caleb, 13, Reece, 11, and Nixon, 3.
The family regularly travel to Bali and Cobb said she had no concerns booking the trip six weeks ago.
The clothing store owner said she wanted people to continue travelling to the island despite recent eruptions.
"Bali relies so heavily on tourism, it's really good for the economy," she said.
The family were set to return to New Zealand on December 3 and expected to enjoy the rest of their holiday without any troubles.
Indonesian government volcanologist Gede Suantika said a red-yellow light visible in ash above the mountain was the reflection of lava in the crater.
Suantika said Agung could spew ash for at least a month but he did not expect a major eruption.
Flight Centre general manager Sean Berenson said some flights had been cancelled over the weekend as aircrafts took precautionary measures following the eruption.
"The ash cloud it produces can pose a threat to aircraft flying in the area.
"This is because volcanic ash is hard and abrasive, and can damage propellers and turbocompressor blades, as well as scratching cockpit windows which impairs visibility," he said.
If the cancellations continued, Berenson said there would be thousands affected.
"Flight Centre currently has around 1000 customers in Bali at the moment or due to travel over the next couple of weeks."
Travel in Bali
-New Zealanders travelling to/from Bali are advised to confirm their travel arrangements with their airline or travel agent directly, prior to travelling to the airport.
-If your travel is disrupted, ensure you keep all receipts to support your travel insurance claim.
-For advice on keeping safe from volcanic ash please see the Ministry of Health's website.
-New Zealanders in Bali are advised to update their registration information or take this opportunity to register with the Ministry of Foreign Affairs and Trade.
-safetravel.govt.nz