It's a potentially difficult office environment, filled with death and disease -- but "Rev Lizzie", as she is affectionately known, finds her job "quite delightful".
"People look to you in times of transition and crisis," she said.
"At the top of the chapel there's a lantern tower, which a lot of people see from their rooms -- it represents Christ, who is the Light of the World.
"But finding light is consistent in all traditions -- so I like to think I'm here to help people find light in dark places."
The hospital chapel was founded in 2011 by Anglican minister Rev Peter Brown, who, considering the hospital was not receiving adequate spiritual support, set up the Wairarapa Hospital Chaplaincy Trust.
The chapel building was constructed with funding from various Rotary and Lions groups, with donations from Masterton businesses, and lawyers and accountants helping set up the trust free of charge.
"We get a lot of community support, which I think shows they acknowledge the need for spiritual care," Mrs Snowsill said.
As hospital chaplain, Mrs Snowsill's role is to provide "spiritual companionship", offering prayer, blessing rituals or a listening ear for anyone who requests it.
She said people perceive the chaplain's role as solely working with the dying -- with a patient greeting her on her first day, when she offered to show him around, with "no thanks, padre, I'm not looking for the cemetery just yet".
But her "flock" are varied: children battling life threatening illnesses, people disheartened from dealing with chronic conditions, people with serious injuries facing disruption to their lives, and older people distressed by no longer being able to drive.
Hospital staff members also often seek her guidance, or request time in the chapel to unwind.
"People come in total turmoil: their lives have been turned upside down.
"The chapel has been a real place of solace for the staff -- it's good for them to find a place to get some peace to gather their thoughts that isn't a toilet."
Her role also involves officiating baby-naming ceremonies and placenta burials, performing the Last Rites for the dying -- using oil made in the Holy Land, by Christian refugees on the Gaza Strip -- and even running a blessing ceremony for a tutorial skeleton unearthed at the hospital.
"It was lovely to honour that person and their remains, whoever they were."
Some of her favourite moments have been working with the elderly, and being able to honour their requests, such as arranging to bring their pets into the hospital for warmth and comfort.
"There's something special about meeting people at the end of their life, as you see their essential humanity.
"They know they're about to die, but they've a light about them -- their essence shines bright."
While she has worked with people of all kinds of faiths, most of Mrs Snowsill's clients have no religion -- seeking to make some sense of their difficult circumstances.
She said even those angry with a "higher power" had found comfort.
"It's a privilege to see people's horizons broaden as they search for meaning.
"You let them put a voice to their thoughts and, eventually, they're able to find their own answers.
"You're not there to impose your story, or to convert them."
She said it's difficult not to be affected by the loss of a patient -- but her aim is to be a source of hope and peace for their family.
"I keep in mind what St Francis said: 'make me a channel of Your peace.'
"But then I see other people later in the street, completely healed, and they say I contributed to their recovery -- and that's truly wonderful."
