Coordination of Benefits Question (U65 on Medicare)

OK, did a search and didn't find this exact question answered, maybe someone can point me in the right direction. I think I know how this should work, but some of these rules are tricky.

U65 just got her disability awarded and has been enrolled in Medicare A&B. She is still within the window to decline B. She is currently covered under her husband's active employment GHP. His employer is a large-group (over 100 employees), so from what I can tell GHP would be primary if she keeps both.

She wanted to know how Medicare would pay if she stayed on the B rather than declining it. Assume that
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