The jockey was killed during an early morning trackwork session at Cranbourne on Friday.

She has been remembered as a much-loved and valuable member of the racing community.

Racing Victoria and the Victorian Jockeys Association confirmed the passing of the 22-year-old apprentice as a result of injuries sustained in the accident.

Claridge was dislodged from her horse while riding on the sand trails on the southern side of the training centre about 4.35am.

She was attended to by the on-course paramedic but was unable to be saved.

WorkSafe, with the cooperation of the Cranbourne Turf Club, are investigating the circumstances of the accident.

Claridge will be remembered as a fun-loving girl who had the world at her feet, according to her old boss, former Hamilton trainer Allan Clark.

"Mikaela's passing is a tragedy," Clark said.

"She was a brilliant student at school who could have chosen a different career path than being a jockey but she loved horses and riding. She worked with me for over a year and just wanted to be a jockey.

"She was a gifted young girl who was the right weight and height to be a jockey. I watched her career closely after she left Hamilton. We stayed in contact.

"Her claim had reduced from four kilograms to two kilograms. Mikaela's passing has really rocked me and everyone else in the racing industry. The dangers of being a jockey are there for everyone to see each day."

Hamilton Racing Club operations manager John Donnelly, who is the long-time track watch supervisor at the course said Claridge's passing had sent shock waves through the local racing industry.

"Mikaela was well-loved by all members of the local racing community," he said.

"She was a very unassuming girl who loved horses. She was well respected in Hamilton by people at all levels.

"Lots of Hamilton people were following her riding career with great interest even though she had moved away. Her sudden passing reminds us all of the dangers of being a jockey."

Racing Victoria abandoned Pakenham's meeting on Friday.

The decision was made in consultation with the Victorian Jockeys Association (VJA) following Claridge's death.

The meeting was abandoned in the interests of participant welfare and out of respect for the rider and her family.

Claridge was inducted into RV's Apprentice Jockey Training Program in 2015 and was apprenticed to trainer Allan Clarke at Hamilton.

A back injury saw her riding career put on hold for an extended period, during which time she undertook and ultimately completed a Bachelor of Primary Education.

She returned to the saddle riding trackwork in 2017, having moved to Echuca under the tutelage of trainers Donna Gaskin and Mick Cornish.

She made her race riding debut at Wangaratta in August 2018 aboard King's Hand, finishing second, and celebrated her maiden victory aboard the same horse at Echuca on September 6, 2018.

Claridge, who this year transferred her apprenticeship to trainer Ken Keys at Cranbourne, went on to win another 28 races during her short riding career, the most recent at Sale on July 11, 2019.

RV chief executive Giles Thompson extended prayers and heartfelt condolences to Claridge's family and friends on behalf of the industry.

"Mikaela was a talented young rider who was pursuing a career in the sport she loved," he said.

"She was a much loved and valuable member of the racing community and her sad passing is being felt by many within our industry today."

Victorian Jockeys Association chief executive Matt Hyland said the organisation and its members were incredibly saddened by the loss of their colleague and friend.

"We are all going to miss Mikaela's bright smile and positive attitude," he said.

"After injury initially stalled her apprenticeship, she had started to build a really promising riding career over the past 12 months working with horses which she loved.

"Our thoughts and prayers at this time are with Mikaela's family, friends and fellow riders who we are supporting in association with Racing Victoria and the National Jockeys Trust."

Cranbourne Turf Club chief executive Neil Bainbridge said it was a tragic accident and one that had deeply saddened all at the club.

"WorkSafe have commenced an investigation into the incident and the club will afford them every support in doing so," he said.

"On behalf of the club, I wish to extend our sincere condolences to Mikaela's family and friends on her tragic passing. She was a popular member of the Cranbourne racing community and will be sadly missed."

RV, VJA, CTC, Country Racing Victoria (CRV) and the National Jockeys Trust are working together to support Mikaela's family, local racing community and industry employees with counselling and support.

Members of the racing industry are encouraged to utilise the free, confidential counselling service STABLELINE on 1300 530 122 if they are in need of support at this tragic time.