I have a screamer.

[Dreamalittledream]

I'm assuming the screaming is an unhappy one? Have you tried isolating her? A playpen (with a few age appropriate toys, a blankie from home) really worked for me. When she cries, pop her in and as soon as she stops pop her back out? Perhaps she's overstimulated? Man I wish they came with a translator sometimes. Is there a room just off your play place you could place the playpen? That kind of would give you and your other DCKs a little break on the volume level? Just a thought.