Her voice alone didn’t get her there — she did. That’s why celebrities are so protective about how their likeness is used: their personal brand is their asset.
There’s established legal precedent on exactly this—even in the case they didn’t train on her likeness, if it can reasonably be suspected by an unknowing observer that she personally has lent her voice to this, she has a strong case. Even OpenAI knew this, or they would not have asked in the first place.