Actually i cant believe none of you know this but Jill, Claire, Barry, Wesker, leon, Chris and all of the rest never actually existed they were just the figment of Ashfields (the head of Umbrella, Alexias/thingys grandfather) imagination while he was having a nightmare after finding out that he his company has exceeded their annual budget and have a high possibility of being closed down. Jill was actually a character from one of his former wet dreams but somehow jumped into the story. all the games youve played are just his dreams.

so there, i bet no one knew that.