Maybe Vadic has some sort of multiple personality disorder and for a changeling that means morphing a part of themselves into a second manifestation hence the floating face.
On the Popcast interview I watched with a producer that works with Terry Matalas we to be seeing in upcoming shows why Vadic acts the way she does he hints it will be in this weeks show we find alot about the changeling plans with Picard and the Titan crew investigating and being at the space station and Raffi and Worf being denied getting info about the Daystrom thefts are connected.