It depends on what you want your essay to be about. Your thesis statement introduces the topic of your essay and lays out what you will be talking about. It looks like the essay is supposed to be about struggle and control. So . . . the thesis would state very briefly her struggles and the fact that she does overcome. It might look something like this:
In Kahled Hosseini's novel,
A Thousand Splendid Suns, Mariam struggles against abuse in her arranged marriage and the subservient status of women in Afghan society to achieve the freedom to live her life as she wants.
Eric Noto