Must she die for you to believe her watch

I think there may be a bit of confusion here!

It seems like you're asking a question about a specific situation, but I'm not entirely sure what you're referring to. Could you please provide more context or clarify what you mean by "her watch" and "believe her watch"?

Are you asking if someone's death is necessary for someone else to believe in the existence or accuracy of a watch? Or is this a metaphorical question?

Please feel free to provide more information, and I'll do my best to help you understand the situation!