irreverent 

Definition:  (adjective) Characterized by a lightly pert and exuberant quality.  
Synonyms:  impertinent, pert, saucy  
Usage:  Sally's irreverent gaiety and ease of manner drew people to her and made her immediately likeable.  

That is definition of "irreverent" in Oxford Dictionary: not showing respect to sb/sth that other people usually respect

"pert" in this sentence means "showing a lack of respect, often in a humorous way"

"exuberant" means "full of energy, excitement and happiness"

gaiety: the state of being cheerful and full of fun

In "draw people to her" of this sentence, draw = attract