Oh sweet flying cupcakes! What on EARTH possessed you to post this on AIBU, mini ?!
Don't make THAT mistake again, will you?! Glad you've found your way here now, anyway... :)
Firstly, to address the original concern... Nothing is irredeemable except death, not even pregnancy or prison. Nothing. And certainly not a PRU. Seriously. Don't worry about what might or might not happen in the future; you have no control over it and you need all the energy you can muster for now. (Weak :) ).
If and when your DD decides she wants to stop behaving like a fool, she can put things back on track. She might have made it harder for herself - even much harder - but she'll still be able to do it. In fact, looking on the bright side the very strength of personality she's showing now will help her sort herself out in the end. 
I know you probably don't believe me when I say nothing is irredeemable, but it's true. Here are some examples...
My friend, abused as a child; ran away at 13; arrested; pregnant at 14 by a man ten years older whom she saw as her 'rescuer'; second baby at 16; no school, no qualifications... Now years on she has a degree, a responsible job, a freelance side business and her own eldest child is off to uni... :)
Or my friend's son, started smoking a bit of dope at 17; held up the local post office with a toy gun "as a joke"; spent 5 years in a high-security prison... He's now a council officer happily married with a baby.
Or my son, who was very like your DD two years ago, but probably worse. Underachieved at school; took a lot of drugs; stole over £1000 from me. And I had him arrested and charged the third time he assaulted me... Now he's back in college, getting merits and distinctions, applying for uni, and has just got himself a part-time paid job as well as the unpaid/volunteer role he's been doing for 3 months.
mini, your daughter will be ok. I don't quite promise, but I betcha or will do, if I ever get that £1000 back .
You, however, are on track for a nervous breakdown. You really, really need to detach and focus some of your (obvious) love, care and concern on yourself. I tell you this with the 20:20 vision of hindsight, because I made myself really rather ill with the stress of it all, and I'm only just beginning to get better. Don't repeat my mistake.
Your DD is clearly unhappy (I said this last time I posted too, as I'm sure you'll remember); happy people simply don't behave the way she's behaving. It is absolutely heart-breaking when we know our babies are unhappy and we can't make it all better for them. We try for a long, long time. You will need (I am guessing, because it was true for me) to mourn for the loss of the happy life you always imagined for your little girl. But you can't 'kiss it better'. You can help her find something that might make her happy, but you can't control her feelings: that's up to her, now.
You can, though, shape your own emotions. Do some more things to make yourself happy. Since your DD doesn't seem to know how, or doesn't think she's worth the effort, show her... :)