Replacement in Heaven

She grew up in a turbulent world of war in the 11th century. But she had periods with no memory of the past few years, when it seemed she had changed sex. It couldn’t be true, could it?
After a life cut short, she roams Heaven learning her new duties and coming to grips with possibilities she’d never even conceived. Finding her other half at last, it seemed it had all been true - in a way.