Pari gbolohun ti o tẹle: Ni Awọn idije Agbaye 2009 ni Rome, Pellegrini tun fọ igbasilẹ agbaye lẹẹkansi ni 400 m freestyle pẹlu akoko ti 3:59.15, o ṣẹgun ami wura ati ni ṣiṣe bẹ di obinrin akọkọ ti nrin lati fọ idena iṣẹju mẹrin ni iṣẹlẹ naa; o tun gba ami wura ni 200 m freestyle o si fọ igbasilẹ agbaye tirẹ pẹlu akoko ti 1:52.98. Ní
2009 European Short Course Championships ni Istanbul o ṣẹgun igbasilẹ agbaye ni 200 m freestyle pẹlu akoko ti 1: 51.17. Ni 2010 European Championships ni Budapest Pellegrini gba ife-ẹyẹ idẹ ni 800 m freestyle, lẹhin Lotte Friis ati Ophélie-Cyrielle Etienne, ati ife-ẹyẹ goolu ni 200 m freestyle pẹlu akoko ti 1: 55.45; ni ọdun kanna, o kede pe oun yoo ṣiṣẹ pẹlu olukọni tẹlẹ ti Laure Manadou, Philippe Lucas.