In 2010, Petrini won gold medals at both the National Triathlon and Aquathlon Championships, as well as the Italian Junior Cup.

At the Everyman's Sprint Triathlon 2010, Petrini again won gold, and finished the year by winning the gold medal at the Aquathlon World Championships in Budapest.

At the opening triathlon in Nice (24 April 2011), Petrini placed 21st, finishing second within her club.

Petrini lives in Rome and trains at the Olympic high performance centre Acquacetosa.

[2] Unless indicated otherwise, the following events are triathlons (Olympic distance) and refer to the Elite category.