Caz began her Paralympic career at the 1964 Summer Paralympics in Tokyo. She took part in two athletics events winning gold in both the slalom and the wheelchair dash. At the 1968 Games in Tel Aviv she competed in numerous track and field disciplines, the breaststroke and backstroke in swimming as well as the singles and doubles in table tennis. She won at least a silver medal in all three areas, finishing the Games with six medals three of which were gold.
Her most successful Paralympics were the 1972 Games in Heidelberg where Caz won two gold and one bronze athletics medals and a gold in the table tennis singles. She entered the fencing event rather than the swimming, winning the novice foil individual event.
At the 1976 Games in Toronto Caz entered similar events winning bronze medals in athletics, table tennis, and fencing.
For the 1988 Summer Paralympics in Seoul, Caz opted to compete in the wheelchair basketball and fencing events. Great Britain did not progress beyond the preliminaries of the basketball having lost all four matches, but Caz won her final Paralympic medal, a gold in the épée individual 4–6. This took her total to ten Paralympic gold medals.
Caz retired from international competitions in 1994.
Since retiring from international competition in 1994, Caz has dedicated her time to helping other disabled athletes.
She also sits on various disabled sports committees including WheelPower’s Sports Management Committee and was fencing team manager in both Atlanta and Sydney.
Caz was inducted to the Stoke Mandeville Hall of Fame by HRH The Prince of Wales in 2003