While I understand your fear for her in her relationship with this young man, I'm telling you not to get stuck there.
So, let's piece the rift back together: Talk to her.
Many parents in this situation fear that their 16-year-old will become pregnant or that her heart will be broken by this young man.
It wasn't long before the teen's mother became worried.
and possibly getting pregnant, perhaps say she can see him but only when you're around - come over for dinner, studying, hanging out while you're there and visible at all times. If they wish to go to a movie or dinner - drive them and accompany them, never leaving them out of your sight. He may grow wary of mom always being around and leave."Denise Witmer's thoughts: I agree with cstone360.
The mom could try and forbid it, but has no way of doing what she would need to do to enforce it. Keep lines of communication open with your daughter, talking to her often about sex, love, family values and teen pregnancy.
Many parents of teenage girls face a tough problem.
Should you allow your daughter to date an older boy?