The Girl had to be taken to hospital after being thrown from a rubber ring water slide at Woburn Forest Center Parcs.
The woman’s brother, Matt, filmed the rapid descent on his GoPro while on the slide, and caught the moment of impact on camera.
The video shows her brother calling out to her to see if she is okay before quickly realising that she isn’t and dismounting the ring at the bottom in an attempt to provide assistance.
Rea lands separately from the rest of the group and appears to be in distress as her brother explains to staff members what happened.
Writing online after the incident, Matt said: