She complained that she was being underpaid. So the Vanguard replaced her with a computer terminal.
The Vanguard are heartless. You better watch your back Rahool.
[spoiler][url=https://analogaddiction.files.wordpress.com/2013/05/last-of-us-joel-tess.png]It is over Tess![/url][/spoiler]
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All of the tower characters could be replaced with a terminal and it wouldn't change much, that's how critical the tower characters are. They all just stand in one spot and sell you stuff.