Immaculate Conception is the miraculous conception of the Virgin Mary without Original Sin
There is no evidence that "Original Sin" exists in the Star Wars universe therefore no Immaculate Conception can take place (or all conception is immaculate)
Even is Anis did lack original sin he was never used as the vessel of a virgin birth (no uterus and no divinity trying to incarnate itself via Ani) and he certainly committed many of his own sins so the IC would be kind of pointless