Therefore, it's likely that her favorite nail polish would be one that is:
* Free of harmful chemicals: She probably looks for polishes that are "5-free," "7-free," "9-free," or even "10-free," meaning they exclude ingredients like formaldehyde, toluene, DBP, formaldehyde resin, and camphor, among others.
* From a natural or eco-conscious brand: Brands like Zoya, Pacifica, Kure Bazaar, or Sundays are known for their healthier formulas.
* Neutral or classic colors: Given her overall style, she probably gravitates towards versatile shades like nudes, pinks, reds, or grays.