You seem to confuse virgin birth and Immaculate conception. It's a common mistake but the two are completely different concepts, and the very idea of original sin is absent from Egyptian myths, as far as I know, so there cannot be immaculate conception outside of judeo-christian religions (unless some other religion also has an original sin aspect somewhere).
Good point. But I was aiming for nonsexual conception. I think we can automatically rule out any hint that Isis was a virgin, since her general image doesn't fit that ideal. The reason I even bring this up is that in the particular myth where Osiris is incompletely reassambled, he is the father of Horus through nonsexual conception.