If she is the one with the timeline then it is far better for you to take your time and do what is right for you. Her timeline is probably more important to her than getting her way. She is pushing you so she can get both. As the timeline nears she will have to compromise or not be on her timeline. That will work in your favor. The closer it gets the more she will just want to compromise to not miss her timeline. Use that to your advantage. Don't let her hurry you.
Please don't let her anger or pressure of her timeline get you to agree to something you don't want to do. Tell her the same thing she told you.. "I'm not signing anything that isn't fair."