About the only thing I can add to the advice already given is "do things to help out because they need to be done and you want to help out". If you run around the house cleaning with the hopes and expectations that she's gonna be thrilled enough to jump in the sack...well, she'll see right through that. If the problem is that she's overwhelmed with the pressures and demands of being a mom, she needs to know that she's not alone it this adventure. That you're there for her to help out with the little things as well as the big things.

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Though I am different from you,
We were born involved in one another.

For it was not into my ear you whispered, but into my heart. It was not my lips you kissed, but my soul.

Complete surrender should not just come at moments in which one faces overwhelming odds, but in the calm when it seems one is personally in complete control of one's life.