After sending the current model off to the team, I wrote out the steps still required in building the model (mesh) for her as:
This isnt a short list, but each piece is a simple bite-offable chunk, so hopefully she will be done very soon. I got as far as working through a logic to do the first one in the list (curving the edge). I ended up using extrude for the edges of the hair inwards. I then averaged the normals to make the sharp edge into a nicer curve.
Just a couple more bits, then I can mirror and send a full (2 halves) model off to James for her rig to be applied.