Crochet yarn as a gift - suggestions and help appreciated

Hello, everyone!

My cousin has recently started a crochet project and i want to get her a bunch of yarns as a surprise gift and a form of support. I was wondering which are the most used yarn colours or the ones that are needed in almost every project? I could ask her what she needs but she would act all shy and "dont bother yourself, please!" And i want to surprise her with something nice since she had a rough year

Help is really really appreciated 🫶