A sinless person does not need a Savior. Sinners need a Savior. Mary acknowledged that God was her Savior. Therefore, Mary acknowledged that she was a sinner.
Ang mga makasalanan ang nangangailangan ng Tagapagligtas. Inamin ni Maria na ang Diyos ang kanyang Tagapagligtas, Kaya nga, kinilala ni Maria na isa rin siyang makasalanan.