Who are the three Homunculi that are with Irisviel and Saber? In Fate/Zero, when Irisviel and Saber arrive in Fuyuki in episode 3 they are accompanied by three Homunculi maids.

One of the three had slightly curvy hair coming from her hood which makes be think it was Leysritt and I assume where she is, Sella would be close by.

I am looking for confirmation of who these three Homunculi Maids are. If two of them are Leysritt and Sella, what happened to the third that prevents her from serving Ilya?
This only partially answers the question. However, in both of their Wikia pages, under Appearance it states that Leysritt and Sella are in fact 2 years old. 


  Despite her appearance, she is only about two years old.


Sources: Leysritt/Sella - Appearance *exact same wording on both pages

Given there is no mention on either of their pages, of them being in Fate/Zero I would assume this would be referring to their appearance in Fate/Stay Night which would make it impossible for them to have appeared in Fate/Zero which is set 10 years prior to Fate/Stay Night.