Marty gave me the look of long-suffering and said, "Really, Mom? Are you going to allow this?" I told her there are plenty of beds in the bay for everyone and she has to learn to share.
She didn't like that answer, so she started a glaring campaign against Shiloh.
Shiloh didn't like being glared at in such close proximity.
She expressed her displeasure.
Meek little Shiloh stood her ground, and Marty ended up (after lots of encouragement from me) settling in the other bed.