On Oct. 11, she shared some footage from that event, along with some powerful archival footage of her advocating for feminist issues back when she was just 10 years old.
The narrator in the commercial declared that the soap is handy because 'women all over America are fighting greasy pots and pans'.
Now, as the Duchess of Sussex, she is still using her voice to shine a light on discrimination and trying to make the world a better place for women and girls everywhere.
To mark International Day of the Girl, Markle used a clip of herself as an 11-year old, talking about her experience making a difference, in the hopes of inspiring other young girls to take action.
She says in the clip: 'If you see something you don't like on television or anyone else, write letters and send them to the right people and you can really make a difference for not just for yourself, but for lots of other people'.
"So, to each one of you: Keep asking questions; keep pushing forward; keep shining brightly", she said in the posted video. Be it lack of access to education, stigma surrounding Menstrual Hygiene Management, forced child marriage, legal or medical inequality, or gender-based violence, there is a pressing need to support young women in their path to excellence.
"The Duchess of Sussex has been a long time advocate for women's and girls rights and at the age of eleven campaigned against a sexist advertisement, which was then changed", the Instagram caption reads.
[Sound On ] Today is International #DayoftheGirl, a day observed globally and created by the United Nations to acknowledge the gender inequality that exists worldwide.
'HRH recently shared a quote during a speech in Cape Town: "Visualize your highest self, and show up as her".
'To all of the young girls reading this today on International Day of the Girl, that quote is for you.
Many fans commented on the post, with some commenting with "Girl Power" and "beautifully said", while one said: 'Happy day of the girl day'.
She ended the Instagram video on Friday with a message to all young girls.
Nick News was an educational program for children that aired on the popular cable network Nickelodeon.
Last month, Meghan gave a moving speech during her royal tour of South Africa with Prince Harry and son Archie, telling the crowd she was visiting as a mother, a wife, a woman, a woman of colour, and their sister.
'It just wasn't right and something needed to be done'.
The young Markle complained in a letter to Proctor & Gamble about a television commercial for dishwashing detergent in which it's implied that women do all the cleaning.
Meghan argued it was wrong to assume only women cleaned dishes and wrote an angry letter to the company, successfully convincing it to change the tagline to: "People all over America are fighting greasy pots and pans".