yes, the multiform is going to be costly for the little girl form, but only the princess is paying for it... from 6E1V
The cost for Multiform, which only the true form pays for, is 1 Character Point for every 5 Character Points the most expensive alternate form is built with (i.e., his Total Points; Matching Complications don’t reduce the alternate form’s cost). The character may pay +5 Character Points for every up to two times the number of alternate forms of equal or lesser cost (i.e., 5 Character Points for up to x2 alternate forms, 10 Character Points for up to x4 alternate forms, and so on). The cost of the true form has no affect on the cost of the alternate forms, nor does the existence of the true form affect the calculation of how many alternate forms the character buys for +5 points