Getting to sleep - Nightmare thoughts - sleep anxiety

Dear All,

my daughter struggles getting to sleep.  This is always on a school night and never in the holidays.  I understand she has anxiety with getting to sleep, the other night she said she felt she needed to read a book on « How to get to sleep » I wonder if anyone knows of anything to help ?

We already have circadin medication, a strict routine of relaxation breathing exercises, relaxing, special meditation stories and a lavender oils diffuser.  

However, even with all the above in place, she said she thinks horrid thoughts, nightmarish vivid thoughts about horrible things before she goes to sleep,  i need to help her with this. 

Any other advice ? 

Thanks :)