Describe Sheila Tubman’s personality using examples from the text

Sheila Tubman is a sixth grade girl who goes to the same school as Peter. She is Peter's arch enemy. She is scared of dogs, even though she has a little puppy. She hates Peter too. Her family and Peter's family share a vacation house in Maine for three weeks. She is Fudge's babysitter when she is there. She is a know-it-all.