Daughter struggling with anxiety

[MammaMac2616]

My teenage daughter is struggling with anxiety in school, she specifically struggles with silence or when it’s really quiet in the classrooms. She is receiving support from school but is there anything I could get her to support this?

Could she be worried about the silence being broken? The unpredictability of a sudden noise? Is she able to explain at all?
It’s rare to find a completely silent classroom as there are often noises from air conditioning, chairs scraping, footsteps etc.
A fidget toy might be a good idea as PP suggests.