"I've said to her I think she's too old but she would be missing out on a chance to socialise with her [very sensible] friends. I suppose this is sort of a wwyd?"
It wasn't long before her fellow mothers came forward with their advice - with many agreeing that 15 was in fact too old for trick or treating.
• Scroll down to vote on the appropriate age for children to start trick or treating
One commented: "15 way too old IMO [in my opinion]. Ours stopped well before going to High School.
"It's for the younger children around here. I don't know what teens get out of it, they would be better off having a Halloween party than knocking on people's doors for sweets at that age."
Many members of the thread said that they were concerned that teenagers would be looking for cash rather than sweets.
One concerned parent wrote: "Anything past primary age is too old. All the primary kids round here do trick or treat, but are supervised.
"There's always a few teenagers trying their luck though, and they always ask for money."
Another user agreed adding: "I'd worry that they'd be up to no good or looking for money. Honestly I don't think I'd let her."
For many mothers, their main concern was that a group of teenagers may upset elderly residents.
Other Kiwis are more sceptical of the whole event, with a swarm of people telling the Herald Halloween has no place in New Zealand.
"Halloween has no place in New Zealand. It wasn't really thought about until the Warehouse commercialised it!"
"An American celebration which has become popular due to globalisation. Not historically a British or Kiwi event."