I te 2009 World Championships i Roma, pakaru Pellegrini te rekoata ao ano i roto i te 400 m freestyle ki te wa o 3:59.15, winning te mētara koura, me te pera riro te kaukau wahine tuatahi ki te wawahi i te 4-meneti arai i roto i te kaupapa; riro ia te mētara koura i roto i te 200 m freestyle ano ka pakaru ia tona ake rekoata ao ki te wa o 1:52.98. I te 2009 European Short Course Championships
I Istanbul, i pakaru ia i te rekoata o te ao i te 200 mita koreutu me te waa 1: 51.17. I te 2010 European Championships i Budapest, i wikitoria a Pellegrini i te mētara parahi i te 800 m freestyle, i muri i a Lotte Friis me Ophélie-Cyrielle Etienne, me te mētara koura i te 200 m freestyle me te waa o te 1: 55.45; i taua tau ano, i kii ia ka mahi tahi ia me te kaiako o Laure Manadou o mua, a Philippe Lucas.