"We want these people to know it is okay to not be okay."
In August, chief coroner Judge Deborah Marshall released annual provisional suicide statistics showing 606 people died by suicide in the 2016/17 year.
The team has goals on educating people around the signs of depression and how they can help.
The funds raised by the team will go into starting a safe haven in Hamilton for those who are feeling depressed to feel safe.
"There is such a stigma behind Henry [Rongomau] Bennett Centre, Hamilton's mental health facility, that people believe wrongly it is a 'loony bin' and they are embarrassed to say they have to go into Henry Bennett."
"We want to start a charity in Rosy's honour to have a rest type care for these people."
Ms Buchanan wants New Zealand to have a nationwide movement to understand mental illnesses and support people rather than doctors just handing out drugs.
She acknowledges the work that Lifeline NZ has done in the past with helping people with mental illness.
Ms Buchanan said the main objective is to show people that life is not always what it seems on social media.
"A lot of people are comparing their lives to other people on social media and then are getting down when they see this person doing things."
"This is just a tiny glimpse of what is going on. In our youth today there is a lot of comparison and it is just stealing people's joy. People found it hard to understand with Rosy. they said she looked so beautiful but most of them only knew her from behind a screen."
The walking team will consist of family members and friends, including Rosy's brother Jay and mum Margie.
For Ms Buchanan, the passing of her best friend has put life into perspective.
"It is now one of my main goals to make a difference for mental awareness in New Zealand."
A givealittle page has been set up to donate towards Ms Buchanan's team's goal of respite care for those battling depression. givealittle.co.nz/cause/therosymayfoundation