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The relevant case law concerns defendants who "use an imitation to convey the impression" that it's the actual person. Just having a voice that sounds like SJ is not a problem, but the "Her" tweet and the fact that they tried to get her on board complicates the issue, and if there's any paper trail that they intentionally chose a soundalike that might be trouble.

Actors don't work in films without detailed contracts, so the normal rules don't necessarily apply in that situation. The producers of Her might have the right to use SJ's likeness in related material. In any case, if they made another movie with a soundalike, the soundalike would be credited and not just called "A", so there would be no confusion about whose voice it was.