[18][19] During school times, at the age of 11, Dilhara started practicing martial arts and Karate-do-Shitokai under Sensei Rohan P. Udayakumara.

[3] She is also following a course on Nurturing Care Framework for Early Childhood Development under the Senior Lecturer Duminda Guruge, at the Rajarata University of Sri Lanka.

Later in October 2016, she joined Damayanthi Fonseka's acting Academy for further knowledge based on emotional balancing and character adaptation in drama.

Then she joined Abhiranga Art Center Negombo, conducted by Randika Wimalasooriya in June 2017 to further learn Drama and Theater.

During this period, she got the opportunity to study art from the Indian Theater Director, Ujjwal Singha In 2016, Dilhara made her first teledrama appearance in Dedunnai Adare directed by Saranga Mendis.

[4] During the same period, she acted in the science fiction television serial Thuththiri, with the role "Urmila" directed by Sanjaya Nirmal.

She acted in the popular serial Sudu Andagena Kalu Awidin aired in Sri Lanka Rupavahini Corporation, directed by Sunil Costa.

In mid-2019, she portrayed the character "Kaweesha" in the television series Dadayam Bambaru directed by Sanjaya Nirmal, which was aired in Swarnavahini.

[8][40] Then she was cast for the serial Sihina Kumari directed by Roshan Weerasinghe where Dilhara played a dual character of two sisters, "Amaya and Himaya".

The series is the first-ever attempt to take Sri Lankan teledrama to international audience via social media where it is airing with English subtitles.

[41] In 2021, Dilhara was cast for the role "Chenugi" in the serial Pork Street where she portrayed the character of a middle-class girl who was struggling financially with her husband.

Dilhara portrayed the character "Navya" and her performance in Looka earned her a nomination for the Best Supporting Actress at the 19th Raigam Tele Awards.

In 2023, Dilhara was cast for the television series Kaasi, directed by Iresh Lokubandara aired on Sri Lanka Rupavahini Corporation.

She portrays the character Sagarika, a middle-class girl who is forced by her parents to marry a man who is twice her age as solution for their financial issues.

In the same year, she was selected for the role Malki in the serial Sidadiye Samanaliyo directed by popular actor Dhananjaya Siriwardena.

[46][47][48] In 2019, she hosted the entertainment program Weekend Vinode along with Udith Abeyrathne and Rukshana Dissanayake which aired every Saturday on Swarnawahini.

[53][54] In 2019, Dilhara wrote the book “Social Invisibility is not a Fiction it Exists” after a four years’ research with emeritus Professor Antonette Perera, Dr. Parakrama Warnasuriya and Dr. Shiromi Fernando.

[63] In May 2017, she organized a campaign for her 22nd birthday to change the focus of the youngsters to support the poor to stand on their feet rather than wasting time on video games.

[8][9] In July 2020, Dilhara organized a three-day climate change camp for children, youngsters and teenagers along with Navarathna and Clark.

The camp included activities to reduce the Environmental Degradation and organized beach cleanups, awareness programs, and campaigns like planting trees.

[70] Dilhara conducted an awareness program on Climate Change and Social Invisibility at the Rajarata University of Sri Lanka with Najith Guruge, Senior Lecturer of the Department of Health Promotion.

[68] On 2 July 2020, she conducted another awareness program along with the senior lecturer Department of Accountancy and Finance Rasika Devundara at Sabaragamuwa University of Sri Lanka.

On 21 March 2021, she joined with University of Peradeniya and distributed rice bags and dry rations to elder homes that didn't receive food due to the prevailing COVID-19 pandemic in Sri Lanka.

Dilhara also held an awareness program to the participants during the event as to how university students can contribute towards minimizing climate change and global warming.

[73] She collaborated with the IEEE WIE Student Branch affinity Group of General Sir John Kotelawala Defence University and conducted the program "EmpowHer" along with Professor Wasana Maithree Herath.

[68] The event witnessed the participation of renowned global personalities including Pope Francis, Denis Hayes, Albert II, Prince of Monaco, Al Gore, Patricia Espinosa, John Kerry, Zac Efron and Anil Kapoor.

[81] On 1 July 2021, she collaborated with the Korean Ambassador of Sri Lanka, Santhush Woonjin Jeong, and initiated the 'Go Green Embassy' program.

During the program, a Mesua ferrea tree was planted at the Embassy premises symbolizing the Sri Lanka Korea friendship.

[82][83][84] On 14 May 2022, Dilhara was invited as a guest speaker by the Korean Ambassador of Sri Lanka, Santhush Woonjin Jeong to the opening ceremony of “Korea Week 2022” which was held at the Colombo City Centre.

[85] On the 9 September 2022, Dilhara was invited as a delegate and speaker for the 4th ICSE Global Conference which was held in New Delhi, India with the participation of 50 representatives from 50 countries including UNICEF, UNESCO, UNEP and WWF.