* Past collaborations and photoshoots: You might be able to find information about the hairstylists she's worked with for particular events or photo shoots online.
* Social media: Sometimes celebrities will tag their hairstylists on Instagram or other social media platforms. This can give you a clue, especially if it's a recurring collaboration.
* Interviews: Occasionally, celebrities will mention their beauty routines or favorite stylists in interviews.
That said, it is generally uncommon for celebrities to publically share that kind of information about hair salons or professionals due to privacy.