Baby-Sitters Little Sister Series by Ann M. Martin

Karen, who is sure that her next-door neighbor, Mrs. Porter, is a witch, sets out to discover the truth.

It's fun to be a Baby-sitters Little Sister! No fair!Karen is having a bad-luck day. Her favorite jeans are missing. There's no prize in the Crunch-O cereal box. And Boo-Boo the cat runs away from her!Karen tries everything to make her day better. But her bad luck just won't go away. She even gets punished and sent to her room!Poor Karen-will this be her worst day ever?

Karen has to get glasses -- two pairs! One pair for reading and one for all the time. Karen does not want glasses. Her school pictures are going to be taken soon! But Karen has to... so she picks out some pretty pink and blue ones. Karen thinks she looks very grown-up. Then Yicky Ricky at school calls her Four-eyes. If Karen wears her glasses for the picture, Ricky will make fun of her. But Karen's not a wimp! Glasses or no glasses -- that Ricky is going to get it.

Karen thinks the ghost of Ben Brewer lives in her house but she's never really seen him until now. Karen and her stepsister have found out that Ben and his spooky friends are going to have a party in her attic.

Karen and her friends go to pony camp expecting to have lots of fun but discover that they have to work at it.

Karen is the only person who believes the circus unicorn can grant wishes, because she has some wishes she wants to come true.