Cornelissen's journey in equestrian sports started early due to her family's involvement in pony breeding. Riding horses was initially a hobby for her. Over time, this passion evolved into a professional career.

| Season | Event | Rank |
|---|---|---|
| 2016 | Open Team | 4 |
| 2012 | Open Individual | S Silver |
| 2012 | Open Team | B Bronze |
In October 2014, Cornelissen suffered a significant injury. She fractured her leg and dislocated her fibula after falling off a young horse. This incident required four to six weeks of rest, causing her to miss the World Cup event in Stockholm, Sweden.
Cornelissen has received numerous accolades throughout her career. In 2011 and 2012, she was named Sportswoman of the Year in Gelderland, Netherlands. She also received the Best Athlete Award from the International Equestrian Federation (FEI) in 2011. Additionally, she was named Sportswoman of the Year in Drenthe in 2008 and 2009.
Cornelissen lives by the motto: "If you want to be the best, you have to beat the rest and the best!" This philosophy has guided her through various challenges and successes in her career.
She runs Landgoed Balkenschoten in Nijkerk. This venture reflects her dedication to equestrian sports beyond just competing.
In February 2023, Cornelissen's horse Parzival passed away. The duo won individual silver and team bronze at the 2012 Olympic Games in London. Cornelissen expressed deep gratitude for Parzival's impact on her life, stating that he taught her valuable life lessons.
In 2008, Cornelissen left her job as an English teacher to focus on professional riding. This decision marked a significant turning point in her career.
Cornelissen continues to contribute to equestrian sports as an athlete, coach, and trainer. Her journey is marked by early beginnings, notable achievements, personal philosophies, and significant life changes.Cornelissen's journey in equestrian sports started early due to her family's involvement in pony breeding. Riding horses was initially a hobby for her. Over time, this passion evolved into a professional career.