Jill and Chris were on a mission together to apprehend Wesker, and while fighting Wesker at the top floor of a mansion in Europe, Wesker was about to kill Chris, but Jill sacrificed herself to save Chris by tackling Wesker out the window.
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But the experiences Chris, Jill, and Claire have had with Wesker are almost not hinted at all in the movies, so it's probably different, especially considering she was under Umbrella's control in the movie and not Wesker's.
Even in the Resident Evil: Retribution there is no explanation for it.
It isn't explained yet that how she got control over her through that spider thing. Even in the Resident Evil: unanswered questions.