The princess has more than 17,700 followers on her page to date.
She has uploaded images of her with her fiance Jack Brooksbank, showing the pair of them gazing at her engagement ring.
According to royal protocol, royals shouldn't have their own personal social media accounts.
The 27-year-old Princess and cousin to Princes William and Harry launched her account on International Women's Day, posting a video of her speaking about her scoliosis, a spinal condition she has long suffered with.
"I can think of no better day than today, International Women's Day, to launch my personal Instagram", she posted on her account.
She wrote: "Happy Mother's Day to my legend of a mother". @sarahferguson15 and to all mothers on this special day!
It is not surprising that Markle shut down her social media account.
One of the most highly publicised (and modern) rules of being a member of the British royal family is keeping your distance on social media, with Prince Harry's fiancee Meghan Markle deleting her Instagram and Twitter accounts as well as her blog, The Tig, after the couple announced their engagement. Princess Eugenie's move may encourage others in the family to open accounts of their own in the future.
Also, the fact that Eugenie is moving out has caused huge problems for Bea, with their father, Prince Andrew saying he won't pay the rent on a huge, expensive apartment if only Beatrice is living there. Taking to her Instagram page on Sunday, the Duchess of York shared a rare picture of her children during a casual country walk.