Written into the script, one idea was for Four to knock over the phone as Amelia is talking. This scene should be more interesting than Four simply wandering into David's office and giving the camera puppy-eyes.
Anyone with a pet cat knows they love playing with inanimate objects by giving them pokes, jabs and pushes to see what they do or how they fall over. As a creature of predatory heritage, Four might have similar instincts so this might be entirely in-character for her.
Preparing for the third act I went back to the adult model. While installing the spine to simplify control over Four, a slight problem came out in that when installing a curve to a spine, the joints will contract to fit the CV curve, which would make reattaching the blendshapes problematic. The solution so far (which has given freedom in correcting the skeleton) has been to essentially fix the skeleton then rebind the skin and paint the weights back on.
As I had done this before a couple of times now I might be able to re-paint the skin weights fairly promptly. That is the plan, as the deadline of mid-May is coming and I have to reserve a week or two for export to a render farm and post-processing.