The interior designer was married to personal trainer Steve Vaughan for 18 years.
The pair met at a bar and got married 11 months later.
Her followers shared messages of support on Instagram during the difficult time.
"Thinking of you, don’t lose your sparkle," said one.
Another wrote: "Take care. Thinking of you."
While another shared: "Always sadness when any relationship comes to an end. But, you are one fierce woman who knows her mind and her worth. Take care."
Shaynna is based in Victoria has two children from a previous relationship, Jesse and Carly.