Courtney reads psychology books because these subjects fascinate her. she really enjoys learning about new approaches to psychology. courtney is being driven by

Courtney is being driven by intrinsic motivation.
Intrinsic motivation means that Courtney will be rewarded internally - she will learn new things and be happy about her newly-acquired knowledge. She isn't looking to get any material rewards due to her interest in psychology - she will be satisfied with the knowledge she will gain, which is why her motivation is intrinsic rather than extrinsic.