Hey Lulu,
I had a big reply all typed in and my STUPID internet kicked me off!!!
It was a witty intro about having a cupp o tea in one hand and shaking your hand with the other :P
I had a few BF's like Mr N... My mum just told me the same things as you have told your DD..... I didnt listen and learnt the hard way ultimately but she was always there for me at the end of it
Your doing the best thing you can by just being there for her... trying to make her see what they are about and hopefully you wont have to pick up the pieces but like any girl we will make mistakes.

I bought home some rat bags there when I was 17ish.... but mum just tried to make me see in the nicest possible way... mainly she tried to get me to question them in my own mind in a 'reverse psycology' way but again....... was just there for me when it fell apart and I found out "The hard way" what they were all about.

Sounds like you are doing an awesome job... I probably am no help as such but I just read the whole post and it made me remember when I was her age and my mum tried to make me see to no avail... but how after so many years I FINALLY saw what she meant and married an AWESOME man and an even AWESOMER dad to our DS and our DD that is 8 weeks of being fully cooked :P
xoxoxoxoxoxooxoxoxox