It doesn't say in the books.
Around 1920
1901
an old vampire changed her.
She was changed into a vampire in 1920
Alice Cullen was changed in the year of 1920, I believe.
she changed about the same year Edward did
Alice No, it was Mary Alice Brandon, she became a vampire in 1901
he became a vampire in 1863
she woke up in 1920 she was 19 she was born in 1901, Alice doesn't really remember her human life.
Edward does not vote for Bella to be a vampire he is against it and Alice Emmett Esme Jasper and Carlisle are for it
She was turned in the 1900's era[ sometime in the 1900's] Mary Alice [Alice Cullen] when she was a human she had premonitions so...They took her to a mental asylum and a old vampire at the asylum changed her to protect her from James ,since he was after her.And that's why as a vampire she has visions.