The psak issued calls out the girls who are riding scooters and electric bikes. Besides for being dangerous, mentioned as an aside, it is a serious breach in tzniyus and the polar opposite of the concept of "kol kvuda bat melech pnima" - the honor of a princess is internal (or often translated as indoors). 

The beis din calls on parents and educators to educate them in proper modest and gentle behavior appropriate for a princess.