In behind the scenes footage the actress revealed: "I found Kirsty's behaviour shocking and painful to play at times but I think Coronation Street have told a really important story that I've been proud to be a part of.
"Sometimes important stories aren't comfortable to watch and aren't comfortable to play, but I've been so proud to be a part of it and I'll forever be thankful for it."
For months viewers have watched as Kirsty lashed out at long suffering boyfriend and father of her daughter Ruby, Tyrone Dobbs.
The storyline came to a head last week as Tyrone was acquitted after Kirsty falsely accused him of domestic violence in a bid to punish him for his recent affair with Fiz.
She claimed the gentle mechanic was an evil, calculating wife-beater before finally owning up to her lies in court.
She confessed that it was in fact her, not Tyrone, who was "the monster'" in their relationship and handed over Ruby to her ex-partner before being thrown behind bars for perverting the course of justice.
Ruby is part of Coronation Street and she is deep in the heart of Tyrone, she's also deep in the heart of Kirsty, so whether she'll let Ruby go - I'm really not sure.
"Kirsty's exit is really heart-breaking," said Natalie, who picked up the Best Newcomer at the British Soap Awards 2012.
She comes face to face with Tyrone for a final time when he visits her in prison.
"I'm glad I came... So I could see you for what you really are," Tyrone tells her.
"She has finally seen the light, I think, but it's not been without a very long and painful journey," Natalie said.
"The last few months for Kirsty have been so high octane, so stressful. It's been such a challenge but fantastic to film and I think her emotional journey has now really come to an end as far as where she can go for now.
And no sooner has Kirsty left the scene there is speculation of her return.
"Whether we'll see the return of Kirsty still remains to be seen," said Natalie.