Don't know what happened with Vourna, all I know is that the Greek Olympic Committee has announced that she will be a part of the team.
It seems it's the IOC that pushed towards her participation to the Games.
As for Psarra, Greek Archery federation claims that Psarra was invited after Ivory Coast declined to participate. They received the quota today.
The news regarding the javelin quota are completely inaccurate, no Greek media has reported anything about it.