Sentence:  Then we're swept back to her school days, where we see her giggling like a regular <WSD>Pippi Longstocking</WSD> as she spies on Rivera (Alfred Molina) applying his creative juices to an artist's model while being berated by his wife (Valeria Golino). 
Meaning of the word marked with <WSD> tags:  A person, especially a girl or woman, given to headstrong, wild behaviour, flights of fancy, or irrepressible optimism.