Unfortunately, Phasma's me performance in VII has doomed that character in my eyes. Basically just rolled over. An ex-janitor basically says give me the keys so I can destroy the Empire's flagship weapon and main base. "OK, here you go, not going to get any hassle from me."
Unless she turns out to be some form of double agent, the character is dead in the water. This wreaked of merchandise marketing. Make something with a cool costume to sell toys. All indications were Phasma to be a key player given she's front and center on the poster and churning out the toys.