The Down Syndrome Association says the community is heartbroken, in shock and outraged after the death of Lena Zhang Harrap.
Police have launched a homicide investigation after the Harrap's body was found near Ōwairaka Domain in Mount Albert, Auckland.
Harrap, who had Down syndrome, failed to return home after going out for a walk on Wednesday morning.
A 31-year-old man has been arrested in relation to her death.
New Zealand Down Syndrome Association national executive officer Zandra Vaccarino told Morning Report the community is in shock and heartbroken by the news.
"I think everybody's probably asking questions now that they may not have asked on Monday."
She says while the incident is tragic, it shouldn't stop people with Down syndrome living a full and happy life.
"I think the most important thing to remember in this situation is this is an anomaly, this is not something that happens all the time.
"It's an incident and we shouldn't let this incident stop all the hard work that people with Down syndrome and disabled people have done through the decades to actually get independence, to have the right to have a great life, to be able to make choices, to have control and to fully participate in the community."
People with Down syndrome and their families want to continue to participate in the community, she said.
"We should be looking at what safe guarding and protections can we put in for all people in our community so that we can all make choices and participate fully in our community and feel safe in our environment."
'This is an anomaly' - New Zealand Down Syndrome Association's Zandra Vaccarino
The family have asked for their privacy to be respected, but Upside Education Trust, Auckland Down Syndrome Association and the New Zealand Down Syndrome Association are working together to liaise on what the best type of support may be for the family, Vaccarino said.
"Our deepest condolences to Lena's parents, family and friends...we are here to provide support," she said.
Those in the Down syndrome community who are feeling vulnerable or have questions can call the association on 0800 693 724.