Just finished the novel, and come on! She's a great tactician and a natural expert with any weapon she picks up. She should have a Unique called 'Raw Talent' that when omega'd or zeta'd looks something like this:
When Captain Phasma has Advantage, she gains 15% Offense and 40% Counter Chance. In addition, whenever she scores a Critical hit, she grants a random ally Speed Up for 1 Turn.
Unless some epic new First Order leader toon is coming out in tandem with the movie, you've got to update Phasma to compete with new releases. And it fits so well with her character.