You can use any age appropriate shampoo for her. Make sure to emphasise on baby shampoo.

For mild cases, just use a gentle shampoo to wash your baby's hair. You can also try massaging mineral or olive oil into the scalp and then washing it out. It's okay to next use a soft-bristled brush or your fingertips to brush out flakes, but be gentle.
For a severe case of cradle cap, your pediatrician may recommend that you use a medicated anti-dandruff shampoo.

Then it must be baby shampoo. Started using it for my baby from 3 months