Phase III is even bigger yet than her previous two phases, but she's not yet a horror, just a small terror. She's fully able to talk now, and all the more trouble for it. As with all of her phases, she has special design considerations here too. She needs to:
Be large enough and able to consume cut up body parts.
Sing and dance
Show some 'growth'/vicious demand (here accomplished by her puppeteer moving from a cross legged position to an upright seated one and flailing their legs as well as going from sitting to standing.
Have an articulated tongue for singing.
As she is significantly larger than her previous phases, she also has these considerations:
She needs a sturdy armature now that she is large enough to cover a puppeteer.
The puppeteer needs to remain concealed.
The needs of the puppeteer need to be taken into consideration that she is not too heavy to operate.
Despite these multiple considerations her format is still of simply a mouth, though now, instead of being operated by a single hand, her head covers half of the puppeteer who operates her with both arms. Their legs are covered with roots and vines allowing for more articulation and motion when they move them about.
This breaks the puppet into three parts for construction:
The head, similar to previous phases but much larger.
The suit for the puppeteer of roots and leaves.
The pot for the puppeteer to be seated on.
While this is a different and disparate approach from the previous two phases, the overall body shape remains similar, and simply has grown in size, detail, and viciousness as before.