It is verry normal. That all I have to say
First and foremost, there is nothing wrong with a child 'experimenting' and finding themselves; however, is there something that has caused her sudden attention to this? Taking her to the family Physician or a Psychologist is not a bad idea. Perhaps, someone has given her these ideas (?) You are the parent, there are blocks that you can put on your computer to detour her from inappropriate websites and places she definitely does NOT need to be. Before it gets too far out of control I would definitely seek advice of a medical professional and do some maintenance on the computer.