score:3
There is only one terminal.
For departures, there are four gate areas: A, B, D and E (A+B=Schengen, D+E=Non-Schengen), and Vueling usually departs from area A.
For arrivals, there are two areas, namely "Arrivals 1" and "Arrivals 2". Passengers arriving on Vueling usually end up at "Arrivals 1", but your friend's friend will be able to see it on the green arrivals screen
Upvote:3
Zurich is effectively a single Terminal although different airside piers are given the names Terminal A, B and E.
Terminal A contains gates prefixed A. It opened in 1971, and it is used exclusively by flights to and from destinations inside the Schengen Area, including domestic flights within Switzerland. It takes the form of a finger pier, directly connected at one end to the Airside Centre.
The majority of Vueling flights are served by A
gates so it is very likely therefore your interest is in Terminal A but some not, so may depend upon whether or not a codeshare and/or the flight's origin.