With only Peppers unfamiliar with the procedures of the Mecha World despite all the knowledge in her head, Sebastia had changed her mind and forced her to change into a little girl instead. (Fortunately, she did prepare a fake kid passport not knowing who would be with her for the infiltration.) Peppers naturally was against the decision but Rei told her that she had to lie her way to get through the immigration passport which even a person not close to Peppers was able to discern she could not lie much.
Thus, Peppers resigned to the fate of being the 'daughter' of Sebastia and Rei for the time being. The only consolation she got was that she did not have to do anything and go through the spaceport.
