Do you think Condys millennia life span was natural for Fuchsias or she passively expanded it through her thief of life powers?

It may have been helped by her Thief of Life powers, however Fuchsias do have obscenely long Lifespans to begin with. The higher on the Hemospectrum, the longer you live, and given Ceruleans live dozens of times what lower bloods live, it’s safe to assume the higher up, the more outrageous this difference is.