Purvis broke the acromioclavicular (AC) joint in her shoulder after being flung from the sulky of Benz Buy in the lead-up to to the third race.
"I am very sore. I have torn or broken my AC joint in my shoulder," she said.
"But it is only a shoulder. It could have been a lot worse."
"I will be in a sling for six to eight weeks and then I will start physio.
"I would say it would be closer to three months before I am back race-day driving."
The incident occurred after Matai Jetstar galloped and veered sideways when horses were in behind the mobile preparing to start the race.
As horses were tightened for room, Benz Buy’s sulky collided with that of Circuit Breaker (Blair Orange).
"It happened quickly, but you could see it happening because we had nowhere to go," Purvis said.
"The carts collided and my one flipped upside down and I was out the side and started doing some roly-polys."
Orange was uninjured and quickly moved to help Purvis when he got to his feet.
"I got up straight away and then I said ‘my neck is sore’, because the pain was going into my neck, and Blair came over and told me to sit back down."
St John personnel attended to Purvis who lay on the track for up to 15 minutes before she was put in an ambulance and taken to Dunedin Hospital.
Benz Buy was scratched from the race by stewards and the Waikouaiti programme was put back by more than 30 minutes.
The mobile barrier used for the meeting was pulled off the track by stewards by race 4 as it unable to speed away from the field effectively.
A moving start, led by clerk of the course Graeme Mee, was used to begin the race. A replacement mobile was sourced from Forbury Park in Dunedin.
Stipendiary steward Liam Tidmarsh said the mobile was not a factor in the incident in which Purvis was injured.
The crash was clearly caused by Matai Jetstar tightening inside runners, he said.
There will be no Waikouaiti Cup run on the second day of the meeting today. The 3200m handicap pace failed to attract enough horses.
Westwood Beach trainer Graeme Anderson will attempt to strengthen his excellent record as an amateur driver.
Anderson won on the Brad Williamson-trained Hot Off The Press on Saturday in his first drive in almost two years.
Anderson will attempt a hat-trick of wins with the Williamson trained-Two Ply in race 1 today.
The Margo Nyhan-trained trotter My Eyre looks primed to race 2 today after his good second on the course on Saturday.
