Has anyone experienced two broody hens fighting/sharing a nest?

And how did it go? Did they coparent too?
Doodle, my white silkie, has been broody for weeks! I finally decided to let her keep a few eggs. This gray (lavender Orpington) monster, Milly, has commandeered Doodle’s nest after more than two weeks on eggs. She waits until Doodle gets up to poop or stretch her legs, adds eggs, and then won’t leave. There are three more identical nesting boxes on either side.
Doodle has had enough and has pushed herself in next to Millie, on the eggs. Do I keep trying to intervene, or just see what happens?

Edit to add: not fighting, but rather, fighting over, custody of said nest