Welcome to the bb forum and thank you for sharing your story.
My daughter fell ill at the age of 13 and a few months later was diagnosed with OCD and anxiety. I have cared for her for the past eight years.
I completely understand your concern and I know how difficult it is to wait for help. I understand the shock, saddness and fear that you might be feeling.
My advice over the next two weeks would be to reinforce to your daughter that while people do unfortunately fall ill, they also get better. And remind her that you have organised an appointment for her and that you will support her every step of the way.
Ensuring she is eating well, sleeping well and exercising is really important. Exercise in particlar offers great benefits and will help to improve her mood.
If she is having trouble sleeping you can buy some Hoarlix at the supermarket and give this a try. It's a powder to mix with hot milk and it is very relaxing before bed.
If she is expressing concern about disturbing thoughts remind her that they are just that, thoughts. And thoughts can't hurt her. Thoughts will pass, they always do.
You can also try to distract her from her thoughts by keeping her mind and hands busy. You could try drawing, painting, video games, movies, bouncing a ball or even jumping on a trampoline. See if anything helps.
If you are really concerned you can take her to see the GP.
Most of all just love her. Be there for her to talk to. And remind her that it will get better.
You hang in there. I'm here if you want to talk some more.
Kind thoughts to you