You're right, she will lose respect for you if you don't stand up for yourself, and giving her more will not win her back.
Be too tough and she'll respond with the same and you will have a bitter fight of a D.
What was your history in the marriage? Were you too tough on her, or were you too passive? Maybe go slightly the other way on this, always keeping in mind it is strictly a business transaction.
M: A really long time. Crisis: 5 years. She's still worth it.
Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl
