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I talked to her, she said she can't do anything, and I can't select the "Ask her for help with Don" option again 

After I deal with Don, the game "ends". I've tried both killing and sparing him, I even checked the wiki which hasn't been undated in 10 months, it says there's a ton of stuff after that which I was really looking forward to, but after I rescue Cassie the game just ends with me having to leave. Any tips?