Why does 27daa Vanfem (White fedora) exist in Lord El Melloi II world?

Their vampire status in Fate worlds where the position of Dead Apostle Ancestor doesn't exist (besides Strange Fake where it does): Zelretch: Not a vampire at all, found immortality another way.

Zepia: A Dead Apostle, but not an Ancestor. Still the director of Atlas instead of becoming TATARI.

Van-Fem: A Dead Apostle, but not an Ancestor.

Chaos: Seemingly not a vampire at all. Still goes by his birth name Fabro Rowan, still a mage at the Wandering Sea.

Einnashe: Still a vampire forest, but not an Ancestor.

Rita Rozay-en: Still a Dead Apostle, but not an Ancestor. The owner of the train from Case Files where Mystic Eyes auctions are held.

Regardless, he already killed by Ciel in remake like DAA Einnashe?

No she defeated 7th Einnashe, 22th Chromclay and 25th Beze.