Her agent says she has at least 30 commercial sponsorship opportunities.
It is the best mark ever by a teenager and 11th on the all-time lists. In the shot put, Tom Walsh beat out rival Jacko Gill (21.11m to 20.23m).
"I remember the first time I bent a pole and it was a weird feeling," McCartney says. "There is nothing quite like it. I felt a bit out of control but I really enjoyed it and kept going.