Lorna Brooke was airlifted to hospital after she suffered a heavy fall during a race at Taunton.
The jockey, who rides with a 7lb claim, came off 16-1 shot Orchestrated in the Pontispool Equine Sports Centre Handicap Chase (4.55).
The incident happened at the third fence, when the horse trained by her mother Lady Susan Brooke was racing in mid-division.
On-course medics were on hand to provide treatment, before the air ambulance was deployed to the Somerset venue.
TV cameras showed it circling overhead before it landed and transported Brooke to hospital in Bristol.
Racing TV reporter Alex Steedman said: “I’m told she is awake and alert.
“She was in communication it is just a case of what sort of physical condition she is in.”
The next race on the card, the final one of eight, was delayed by just over an hour.
Brooke, who had ridden seven winners over the past few seasons, took the inaugural running of the Today FM Ladies Handicap Chase at Fairyhouse in 2015.
Racing fans took to social media to send her their best wishes.
One said: “Thoughts go out to Lorna Brooke and all concerned. Looked a very nasty fall and let’s hope she makes a full recovery.”
A second person added: “Hope to hear good news of Lorna Brooke, who has been airlifted to hospital after a fall at Taunton.”