Neighbours viewers watched on as a medical oncologist informed Sonya that her ovarian cyst was cancerous.
Not only that, the cancer had spread to her entire body and was explained to be stage four.
Actress Eve revealed that in the coming episodes, Sonya will be in denial over the news.
Shocked at the prospect of the news, Sonya will decide to keep it a secret in order to “protect” those around her.
Eve explained: “I think there’s a level of being in shock. Given everything that’s happened in her life so far, she thinks, ‘Is this really happening?’
“Sonya also wants to protect everyone around her. She wonders what it’s going to do to Jarrod, her daughter and her son.
“There’s an element of trying to be strong for all of them.”
However, the strong character will try to win back some control and start living with a different mindset.
Eve told Digital Spy: “There’s the shock and then there’s this sense of pragmatism.
“She thinks, ‘If I’m practical, then I’m gaining some control over the situation that I actually have absolutely no control over’. So I think that’s where her mind is at.”
Fans have watched her Sonya’s relationship with Toadie Rebecchi (played by Ryan Maloney) for nine years, with the pair finally getting married in recent years.
The star of the Australian soap went on to note how fans will be “pretty upset” by what’s to come.
Eve said: “If you’re someone who invests in Toadie and Sonya, I think you’ll be pretty upset by it.
“But there has been such beauty that’s come out of this storyline, both off-screen and on-screen.
“I certainly felt that the whole cast, outside of their characters, were incredibly supportive of this storyline.”
It won’t be just Sonya who struggles to deal with her diagnosis as husband Toadie will hit out at Dr Karl Kennedy (Alan Fletcher).
Actress Eve told Express.co.uk: “Where he does put all of his blame is on Karl?
“Toadie, in his reactive anger, although he knows the logic of it, he still thinks, ‘Well if Karl had picked it up sooner, we could’ve got it sooner and we could probably do more.’
“That’s where his misdirected anger goes.”
Neighbours airs on Channel 5 at 1.45pm and 5.30pm.