And that's the reason we had sex education in the third grade (Germany). I was able to talk to my parents about sex even before. Blowjobs were a thing before the seventh grade, but I can't remember a single girl that got pregnant in before the Abitur (grade 11-13).
Even that is too young. If you can't properly care for the child financially/emotionally there's no point in raising one.
That said, OP, you shouldn't discourage sex. But you should give a good sex education and encourage to have safe sex if she has it. Although I agree that 11 is too young to start the birth control pill and I don't know if she knows how to properly let him use a condom. That's the actual reason she's too young for sex and she should wait a while. Also, if you're open about sex, the magic disappears and she will experiment a lot less. But it should always seem like it is her decision, or else she will always feel slightly discomfortable with it.