poll: who's to blame?

Don't google. All comments are screened until I post the results on Wednesday, so you can't be influenced by others' answers.

Scenario: Janet and a friend are kayaking in a part of ocean with many jellyfish. The friend asks Janet if she should go for a swim. Janet has just read that the jellyfish in the area are harmless, and tells her friend to go for a swim. The friend is stung by a jellyfish and dies.

Q: Is Janet morally responsible for her friend's death?