From what I've played so far and read about so far, you have to complete ALL the dispatch missions and then Agent Walker comes back and gives you one more mission. After you complete the mission Agent Walker gave you, Evelyn is once again reunited with her father. Hope this helps! =)
Chat with our AI personalities
To save her you have to complete all the dispatch missions, after that you should get one last dispatch mission from Agent Walker called One more time after your agents have completed that you will get a short ending where Evelyn comes back and is reunited with her father.
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