Sorry for the long delay, overall don't like to guess on cross breeds.
"The creation of a mosaic involves putting different pieces together to create an image. In a way, the Mosaic Chicken is just that. These birds are not an actual breed. They are composed of other different chicken breeds. For this reason, a lot of things regarding these birds are unpredictable. Depending on your view, this would either be the Mosaic’s most or least appealing quality."
What we know about that F1 hen is that she is id+ and Fm/fm+ with 50% of the Gold Neck D'uccle. Which is Millie Fleur with Dominant White.
So she appears to be ER/eb, Co/co+, Mo+/mo, I/i+(Heterozygous dominant white), Fm/fm+, id+/- and s+/-
If you cross her back to Golden Neck, you have chances of getting many that will look golden neck(columbian and with mottling) others will look millie fleur, others will look columbian restricted and other mainly white or black.
That Silkie rooster does not look partridge but red.. If you cross with that rooster all birds will have black skin(50% males will have lighter dark skin). All of them will have normal feathering and mostly gold or black/white