While many of your daughter's friends might have parents who don't check up on their whereabouts during these hours, that doesn't mean that you should follow these poor parenting practices. You need to know where your daughter is and whom she's with at all times. That's your responsibility as a parent who is concerned with the health and safety of your child. Your daughter will try to guilt you and test you to get her "freedom." You can offer her understanding; try to provide her with safe, supervised after-school environments; and explain your reasons and values regarding her after-school activities.
Setting limits and rules in this area is essential. It's a teen's "job" to push those rules and limits and it's your job to stand by them, always offering explanations about why the rules will remain in place. The after-school hours are tough for teens who don't have regular extra-curricular activities to occupy them. Brainstorming with other concerned parents about ways to get your kids involved in activities they would enjoy is something you might pursue.