Read your follow up posts and fucking hell OP, you sound like you absolutely hate her. I'll bet she knows it, too. Don't think I'd be doing very well under the circumstances either.
'Mama never loved her much, daddy never keeps in touch..' is a line from a song that pops into my head.
I've no doubt you're coming from a place of concern (some of it, anyway) but have a look at yourself before you turn the judgement on your daughter.
I'm completely surprised at the lack of fucks given, and sympathy towards her re her dad leaving. That shit messes kids up. Of course, it doesn't excuse the behaviour, but it can go some way to explaining it, too.
Normal/healthy teenagers don't stay in bed for days on end. I speak as one of those, previous, teenagers. Funnily enough, I was in quite similar circumstances to your daughter. I was massively depressed but didn't know it because I could function (sort of). My schooling suffered, and I didn't even sit my GCSE'S and effectively left school at 15.
I've done not too bad. I could have done better - though not under the circumstances, and I say that with a decade ish of perspective since. I have no GCSE's, no degree, and I work with people who do have degrees, and usually need them to be working where we are. I got here by hard work, applied myself in other ways, when I got back on my feet. It was fine. Academia isn't the be all and end all to life. Education is massively important, but I dare say you sound as if the world is ending and are stressing her out so much so, you're having the opposite impact.
Of course I'd recommend kids don't do it this route, and sit their exams and do well at them. It cannot harm them, only help. But it's not the only way. Support your daughter. Love her. Realise that she is not you, she is her own person and you can guide her and advise her, but she will make her own choices however frustrating that is. Realise that she has had a tough time - the way she speaks about her father speaks volumes, if you stop to actually listen. Hating her, will only result in having one less relationship with your kids in the future. Doesn't sound like it'd be that bad for you though, to be honest.
I was offered counselling too. It helped not one bit - I didn't want to attend it at her age, was forced to. When I was ready, as an adult, with a more mature brain to process things sensibly, I sought counselling myself, when I SAID SO. It did wonders then.