Alice Cullen??

i have read all the books over and over but i still don't totally understand her story. can someone explain??

thanks!!
Update: okay i think people dont know what i'm asking. i have read the books.!!
I know they explain it in twilight and new moon but i just dont exactly understand it!! so please dint tell me that they say it in the book!! just give some detail!!!!! thank you
Update 2: i only want to know what happened before she became a vampire. i read the books, i know what happened after!!
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