If she's young, help her build good habits. The important stuff has to happen first, before the fun stuff. That's not just for video games, that's everything.

If she also likes sports or playing an instrument or reading, help encourage a healthy balance. I personally game 3ish hours a lot of evenings. I also exercise 2ish hours each day because I like to. I don't feel like I'm giving up potential time for one by spending time on the other because I enjoy both and I balance them.