Help me write a thesis statement?

i'm trying to write a thesis statement about how Elizabeth Proctor (from The Crucible, you don't need to have read to book to answer my question) is not the moral, truthful woman she pretends to be because she lied in court to save her husband. also if possible i want to use an antithesis, something like. Because Elizabeth Proctor violated her morals, she has no morals. is that an antithesis? please help. Thanks!