She sounds like a control freak, and you're right....the ultimatums in this relationship will likely never end. She's mentally castrating you. Are you going to be okay spending the rest of your life like this, under the thumb of your partner and her petty 'ultimatums'?? Pretty soon she'll be withholding sex or threatening divorce if you don't do what she wants. Sounds terrible.
Therefore, my answer would be: NEVER.
Live as if you were to die tomorrow. Learn as if you were to live forever. - Mohandas Gandhi