Question

Why does Helen's sister kill her own husband?

She did so in order to get even with him for sacrificing their daughter.
She knew that the Greek ships would sail safely to Troy without the favorable wind.
She was trying to prevent their son from killing her.
She thought that the favorable wind was more important to her husband than she, herself, was.

Answer 1

she thought the favorable wind was more important to her husband than she,herself, was