Hang in there, Kim... the teen years can be so tough. It sounds like you're doing absolutely everything you can to ensure she stays safe and well regardless of the choices she's making. I just thought I'd put it out there as my mum got me the Implanon at 16 or 17 and I ended up 30kgs heavier, on anti-depressants and suicidal - and I didn't have any idea the Implanon played a part in all that until many years later, so I thought you should know if you didn't already that it does have its risks It's great that you have such an awesome GP who takes a personal interest in your DD's wellbeing - very rare these days to have someone you can trust!
All I can say is that we're here for you, and it appears to me that you're doing everything in your power to be there for your DD and protect her if she won't be guided through these difficult years. I was a lot like her, just had to make my own screw-ups and learn the hard way and I'm glad I came through it all okay. I'm sure with you and your DH behind her, your DD will, too - it's just really tough to try and enforce rules that are for her own good, and watch her get caught up in risky behaviours and know that she's at an age where all you can really do is be there for her when she wants/needs you. Keep holding on, you will all get there. xx