Proud Krystel uploaded a couple of videos of her daughter to Facebook on Friday.
But now one of them has amassed more than 12million views.
It shows Maya walking down the street in her headless costume and it is so convincing that people have been commenting in their thousands.
Giselle Fernandez Silva said: "This is amazing! I'm tired of princesses, super heroes and other costumes which don't make sense."
More pics from yesterday's Halloween! @ Southbay Village
Posted by Krystel Hwang on Saturday, 27 October 2018
While Melissa Das said: "That's awesome. Best costume ever. And then they put her treats in her neck."
The post also has more than 64,000 reactions and around 189,000 shares.
Jerry Huang commented: "That's the coolest costume ever thanks for the idea
While Angela Hussey said: "I saw that yesterday, it took me a while to figure out the proportions cause this looked legit."
Trick or Treatin' without the pumpkin basket! 😂😂😁
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Posted by Krystel Hwang on Saturday, 27 October 2018
In another of the videos Maya and her sister can be seen approaching a resident of her village.
Instead of taking the treats with her hands, Maya instructs the gob-smacked resident to put them in her neck - where her head should be.
The videos of the duo are continuing to attract thousands of views and their hard work will certainly take some beating.