Re: Beverley & Dianas clothes...
Troi did look better in a uniform, and if I remember correctly Jellico said he wants formality on the bridge. So while doing her duties to the crew in her office, she could wear whatever she wants. That's how I understood his order.
It keeps Carol Anne very close to it and away from the spectral light. It lies to her. It says things only a child can understand. It has been using her to restrain the others.
To her it simply is another child. To us it is the beast.
Now let's go get your daughter.