Didn't the 4th Skrull become a Politician in the Avengers Kree-Skrull war??? In the Marvel books, Mr. Fantastic hypnotized 3 Skrulls to become Cows, and the 4th went on to become a US politician.
CM killed one that was on a train, another was impersonating Coulson in Fury's car (Later became the alien autopsy) and Yon-Rogg killed the 3rd Skrull in a shed.
If she killed the one on the train, then why does she look so confused on the train platform? Also the shoulder grab of the man she suspects is the skrull after the train fight on said platform...
The Disgruntled Greek