Those birds aren't lavender. They are blue. The brownish neck is probably a silver (double blue).
Assuming drake and hen are both Blue Pie.
Your offspring probability should have been: 12.5% Blue, 25% Blue Pie, 12.5% Silver Pie, 6.25% Silver, 6.25% Black, 12.5% Black Pie, and 25% White.
They drake and ducks in the middle (daugther) are blue but the duck on the left is more of grey, perhaps different shades of blue? If so she is self blue. Let me give you a better picture
That's still not the best picture.
I need to take a proper one when they are next to each other.
Maybe she is pastel blue?
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