Hello Boo. Sorry that you have had no replies yet. This must be a really tough time for you, your daughter and all of the family.
Time, space and routine are the friends of anxiety. If you can afford it, you could get her some sessions (weekly) with a qualified, person-centred counsellor. You can find them online. CBT is what the NHS are usually able to provide but it isn't always the quick fix they hope it will be. Concentrate on the basics with your daughter - ensure that she gets the right amount of sleep, that she eats nourishing food, regularly, that she exercises (even if only walking or swimming). It sounds a pathetic thing to say but a healthy body really can help to support a healthy mind, and looking after herself physically can lay the foundation for looking after herself mentally.
Don't belittle her anxieties, but do try to help her to see things with a wider perspective. What she really needs to know is that she is ok just as she is, and that there is world enough and time for her to get an education, get a boyfriend, get a best friend, get everything whenever she feels ready. She needs to remove the pressure she is putting on herself to do those things at a time when she isn't really ready to do them, or they are simply not available to her for whatever reason.
Sadly anxiety is rife among teens these days, and there is no doubt that it is very, very hard for girls (and boys) to make the transition from childhood through their teenage years to adulthood. Others will seem to be breezing through it but one of the biggest lessons for any young adult to learn is that comparing yourself to others is a route to madness!
Help her to find out what she likes doing, and let her know that her likes and dislikes are just as valid as anybody else's, no matter what they are.
Best of luck. I hope that she pulls through this and learns to love and trust herself. And I hope that you have some support for yourself too. Don't be afraid to refer yourself for counselling if you need it; supporting a loved one through any mental health difficulty is tough.