Kammala jumla mai zuwa: Heinz ya yi gasa a Wasannin Pan American na 1951 yana da shekaru 15, ya lashe lambar tagulla a mita 100 da relay 4 x 100 mita. Bayan shekara guda sai Heinz ya shiga gasar Olympics ta 1952 a Helsinki, Finland. Ta gudu a cikin
100 mita kuma ya gama na uku a zagaye na farko, ya kawar da ita daga gasar. Bayan 'yan kwanaki kawai sai ta shiga cikin mita 200, kuma an sake fitar da ita a zafin jiki bayan ta gama ta huɗu. Taronta na karshe a wasannin Olympics shi ne tseren mita 4 x 100 tare da abokan wasan Lilian Buglia, Gladys Erbetta da Ana María Fontán. Tawagar ta gama a matsayi na uku a bayan Ostiraliya da Netherlands kuma don haka ba ta ci gaba zuwa wasan karshe ba.