The following books are currently available on Audible:

The Spark Sisters:
The Line Below links: US, UK, FR, DE
Kick links: US, UK, FR, DE

Pepper Jones series:
Pepped Up links: US, UK, FR, DE
All Pepped Up links: US, UK, FR, DE
Pepped Up & Ready links: US, UK, FR, DE
Pep Talks links: US, UK, FR, DE
Pepped Up Forever links: US, UK, FR, DE
Pepped Up & Wilder links: US, UK, FR, DE

Defiance Falls Trilogy:
Defiance Falls links: US, UK, FR, DE
Defiance Falls Revolution links: US, UK, FR, DE
Defiance Falls War links: US, UK, FR, DE

Stark Springs Academy Trilogy:

Black Diamond links: US, UK, FR, DE
Double Black links: US, UK, FR, DE
Black Ice links: US, UK, FR, DE