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she had the t-virus or whats left of it inside her body still and it most likely left her half dead(the reason wesker had that device controlling her was cause of that)and upon removing it returned her to normal jill without the t-virus this is just a theory ok. wesker saved her and discovered the dormant virus still in her body he kept her alive to get to chris and also for the virus and antivirus in her still.

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