"gerefteast;d-934218" wrote:
When she aged up, it also changed to that non-CC hairstyle
The game will change the hairstyle of your Sim on aging up. (Don't know why the developers thought this was such a good idea. Like you, I find it annoying.) NRaas Overwatch has a setting called Purge Genetic Hairs which "enables a nightly purge of new genetic hairstyles". Otherwise, I don't know of any other way to prevent the game from doing this.
When you click on SimplyJen's S3PE link above, it takes you to the Simlogical page for the program. When you click on the link for "Windows Easy Installer version", that link takes you to SourceForge where the program will be automatically downloaded for you.