What does jamais elle ne vivrai pas sans toi mean?

"Jamais elle ne vivrai pas sans toi" is grammatically incorrect in French. However, it seems like you're trying to convey the meaning of "She could never live without you."

Here are some grammatically correct ways to express this in French:

* Elle ne pourrait jamais vivre sans toi. (This is the most literal translation and is grammatically correct)

* Elle ne vivrait jamais sans toi. (This is a more poetic way of saying it)

* Elle ne pourrait pas vivre sans toi. (This is a less formal way of saying it)

The sentence you provided is a bit awkward because it uses the double negative "ne...pas" which is unnecessary in this context.