Petrik competed at the 1966 World Championships where she shared the team silver medal (gold went to the Czechoslovaks) and earned an individual bronze medal on the beam.

[1][2] Her gold medal on floor was very controversial because originally, Čáslavská won outright.

After the competition was concluded, Petrik's prelims scores were changed to let her tie with Čáslavská, an action which caused Čáslavská to publicly defy the Soviets who had recently invaded her home country.

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