After the first 2 weeks of being created Alice 'matured' in a matter of speaking according to her mother/creator's records. This stage, which was designated as her 'pre-teen' stage, became focused on a more humanoid outlook by replacing the ditrigrade legs for humanoid ones, not to mention applying some resemblance of breasts to her outer chassis so as to not confuse technicians for her 'gender' as the previous form did.

Also, it seems her outer armor has been greatly influenced by one of her favorite video game series, Megaman.

Visual data provided via  boag