Miranda's hair-continuity

At the beginning it is past her waist and curled so if straight it would be even longer. In London,it goes from waist length, to the middle of her back and below her shoulders when straight and in Majorca it is past her waist again.
I do not believe that she would have cut it so it had to be terrible continuity in the hairdressing department. It may seem a little thing,but it drives me crazy ! 

"I say ! Open this door at once! We're British !"