In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Q: Sentence1: Libby wanted to join an after-school science club. Sentence2: Her mom was concerned that she was too young. Sentence3: Libby asked her teacher to send home information on the club. Sentence4: After reading the information, Libby's mom decided to let her join. Sentence5: Libby was excited to be part of the club.
A:
Teacher, Her mom, Libby