help how to get rid of lice in the hair

my sister is 17 years old and still struggling how to get rid of lice she was really insecure about it, please recommend some products that is really work for it.

Skin type: Normal

Age/Gender: 17/F

Current Skincare Routine: none just ordinary shampoo

Main Concern: Lice in the hair and kuto

Lifestyle Factor: palagi siya nasa initan, and siguro dahil sa ordinary shampoo lang gamit.

Budget: Budget Friendly only 200 to 300