The Australian actress, whose character Melissa Bannon was killed off in a car accident in last night's episode, recently left the show to pursue a Hollywood career after about two years in the role.
Ventoura told the Herald Sun: "It was really important that we kept [the storyline] on the down-low because of the impact from the shock of it.
"Literally it comes from nowhere - it is such a shock and if it was ruined, it would have been such a shame. So we were trying really hard to protect the viewers.
"The mood on set [while filming the scenes] was very sombre, very intense anyway - and then added to that was the fact we couldn't go home and share it with our friends, 'My God, you'll never guess the day I had at work'.
"[Leaving the show] was like leaving your family. I said to someone it felt like I was ripping my right arm off. It's been a part of me for so long. It was really emotional.
"But I trusted implicitly that [producer] Jo Porter and the writers would do it the best way possible and they really have. I feel really humble that they've trusted me... with this storyline, because it is huge."
Ventoura also revealed that she has had "a couple of auditions" since moving to Los Angeles.