She went to his house once or twice, all when parents were home.
When she has been out later with others I often pick her up (the joys of cell phones!
This totally embarasses her and she doesn't want to talk about it, but I think she's listening.
The new shot that prevents cervical cancer would be a good idea too.
Make sure she has condoms if she will be alone with him.
When she saw him I kept my cell phone on and when they were alone for the first time and he was pressuring her for sex, she called me and I picked her up immediately.
I think it's a matter of what you are comfortable with and what she wants too.