Abbey and her brother Daniel spoke to the Herald about their loss and their new journey, raising their little brother and making sure he knows how special his mother was.
Sarah Elizabeth Steele died on October 16.
In mid-2019 she was diagnosed with breast cancer and fought hard to beat the disease so she could be there for her four children - Daniel, 25; Abbey; Fionn, 14; and Phoenix.
She underwent numerous surgeries including a double mastectomy, chemotherapy and radiation and was declared cancer-free just before her 45th birthday in August this year.
Four days later Steele was given crushing news.
She had been having headaches and feeling nauseous and went to hospital for a check up.
There, she learned that she had metastatic brain cancer.
Steele - who had also just welcomed her first grandchild - had three incurable tumours on her brain and doctors suggested she start considering palliative care as she would not survive long.
However, Steele refused to give up, saying she had too much to live for.
She underwent major neurosurgery and was awaiting another course of heavy radiation when she was diagnosed with leptomeningeal carcinomatosis, a very rare complication of brain cancer.
And it was terminal.
The Steele family were told that Sarah only had hours left - but the mum-of-four held on for a week, which her family say was a true testament to her strength and her will to live.
"We're adjusting to life without her now, which is hard," Abbey told the Herald.
"We're taking every day as it comes, it's a struggle - mum was our world and the glue that held everything together.
"One of mum's wishes before she died was that I take over the care of Phoenix, so I'm trying to keep his life as normal as possible."
Abbey and Daniel have their own jobs, but are also continuing to run their mother's landscaping business.
She had worked hard for the past 15 years to build the business and her adult children wanted to keep it afloat - which meant dealing with customers, staff and admin on top of their normal nine-to-five jobs.
But they are managing.
"We're doing alright, I'm back at work and Abbey is doing a great job looking after Phoenix," said Daniel.
"We were all so proud of her ... she fought so hard to be here for her family.
"She was the most amazing woman you could meet - she was so strong, right up until the end.
"She raised us on her own and ran her business, she did it all. Even when she was sick she was doing all she could to stay and be here for everyone ... we're all so proud of her, she was amazing.
"She wanted to beat this, she wanted to fight this and get through it ... that's what we will tell Phoenix."
Daniel added: "She was so caring and loving, she always put her family first ... she was awesome.
"She was an amazing person and we just want people to know her story."
If you want to donate to the Givealittle page to help the Steele family raise little Phoenix - visit https://givealittle.co.nz/cause/support-for-sarahs-young-family or click here.