My Daughter Is 14 Years Old .despite Using Sunscreen Of

my daughter is 14 years old .despite using sunscreen of spf 30 she gets tanned from the school game activities .we live in karachi and this problem is more here.the tanning is very obvious and very dark. i think she is very sensetive to sun as my other daughter having the same routine goes not get affected like her.
please suggest the method to remove the tanning