Is she sharing a room? DD2 slept with us for about 6 months because I didnt want her waking her sister so I understand that frustration. It seems to have worked out much better for them not that they are both in toddler beds.
No but the rooms are close. Mine isn't and I can still hear her screaming. Actually DS4 is a pretty good sleeper so unless she's really hollering I can leave her...