The last class we learned when use Have Something Done OR Get Something Done.
The two are used to refer to actions that are made for the subject. Have a little more formal to get and get is more frequent.
I publish some examples of sentences about the Britney look´s, but I had some small errors... I´m sorry :(
The correct form is ...
She should get her hair styled.
She should get a new hairstyle.
She should get herself made-over.
She should get her nails manucured.
She should get more exercise.
She should have a shower.