A love triangle between Natasha, Andrew and Summer is formed. Natasha's feelings for Andrew grow when they organise a party together, but she notices Andrew's concern for Summer when she collapses and warns Summer away from Andrew. Natasha later asks Andrew if he loves her, but he does not reply. In December 2010, Summer and Andrew give into their feelings for each other and have sex. Novakovic said Natasha would be "devastated" if she knew what had happened and that she would not let Andrew and Summer off lightly. Andrew tells Natasha that he is going to Business meeting, but he meets Summer instead. While they are together in Summer's house, a fire breaks out. Natasha sees the smoke and calls her father and the emergency services before entering the house to rescue Summer, unaware Andrew is also there. Novakovic explained Natasha's ordeal: "Natasha is pulled from the fire by her dad, Michael. Andrew and Summer are rescued separately, and Natasha has no idea of the reason why Andrew was in the house - he was cheating on her with Summer!" After the rescue, Natasha has to come to terms with the fact she will be scarred from a burn she sustains on her neck. Novakovic said that it is a "big deal" for Natasha, as she aspires to be a model and this could ruin her chances. Novakovic also opines that Summer wants nothing more than to be with Andrew, but how can she take him when Natasha tried to save her? Novakovic believed Natasha was blasé to their feelings adding "Deep down, I think Natasha knows that there's something going on, but she doesn't want to admit it to herself. But sooner or later, I reckon she'll have to face the inevitable."
Holy Soap ran a poll on who Andrew should be with and 16,000 votes were cast, with 92% of viewers choosing Summer over Natasha. In June 2011, a Daily Record reporter called Natasha a "wayward teen" and said her relationship with Ivan was likely to end in tears. In August 2011, Anthony D. Langford of AfterElton commented "the show really needs a new direction for Tash. Her endless Stunts and tricks are kind of boring at this point. Tash is a likeable character, and I love her friendship with Chris. But this character needs some growth and a new direction. And perhaps a love interest as well." Langford later said Natasha just simply asking Aidan Foster (Bobby Morley) if he was gay or straight was "so in character that you weren't shocked when she did it." All About Soap's Claire Crick praised Natasha's reaction to finding out that Michael and Emilia were having an affair at the time of her mother's death, saying "we can't help but love her rebellious revenge!" Crick explained "After being in the dark about her mum's death all her life, you can't blame Tash for lashing out, especially when she assumed that her dad was keeping things secret to protect her...when in actual fact he was just protecting his own sordid secret!" She added that she could not wait to see what happens next, "especially if it involves more from the tearaway teen – go, Tash!" A Channel 5 website Writer commented that Natasha was "one of Neighbours' most colourful and controversial characters".
On 1 November 2012, Novakovic confirmed that she would be leaving Neighbours to pursue acting opportunities in the United States. Of her decision to leave the serial, Novakovic stated "Australia is small compared to what else is out there, especially in Los Angeles. I love acting and it's what I want to do, so why not be in the thick of it all? I certainly love to do more Aussie things but, being realistic, there is nowhere near as much opportunity here." During her first interview since announcing her departure, Novakovic explained that her main reasons for leaving Neighbours were to try other things and explore different characters. The Actress said that she had wanted to do two years with the show, but when the time came, she decided to stay for another year to prepare herself to leave.
Novakovic told Kilkelly that she did not have the full details of how Natasha would leave, but said that it would involve "a drive off in a car". She did not mind Natasha leaving the show without a dramatic exit, stating that leaving on good terms would be good. The Actress commented that she had loved her character's transition from "bratty" to "almost nice" and believed that Natasha was still herself no matter what she had gone through. Novakovic was pleased that she got to explore every aspect of Natasha and go through every emotion with her. She added that she wanted Natasha to be remembered by the viewers. Novakovic filmed her final scenes in December, but Natasha continued to appear on-screen until 29 March 2013.
