She began swimming as a baby, taught by her mother, a swimming coach. She started competing at the age of 12.[5]
Delfina participated in two junior World Championships (2015, 2017) and also in a senior short course World Championship (2016).[6]
She made an Argentine record in 800 metres at the 2016 FINA World Swimming Championships (25m), where she came in 6th place.[7]
She participated in the 2017 FINA World Junior Swimming Championships held in Indianapolis, USA, where she won two events: the 800 and 1500 metres freestyle. She also won the silver medal in the same competition in the 400 metres.[8]