Hi Lulu, my daughter will be 15 in May, as yet no major issues have arrived, well none that I have heard of,but kids being we don't always hear everything.
I know where you are coming from when you say you're feeling powerless about the times ahead, I guess you just have to know and trust that you have done everything in your power to make sure that she is aware of what is out there.
My daughter is at the stage where she wants to go to shopping centres with her friends and get there by bus, it has taken me a long time to let her do this, she has really had to show me that she can be responsible, so far so good.
She is doing a self defence class as well (Aikido) she loves this, and it gives us peace of mind that she will be able to look after herself better if need be. Every little bit helps