Please we need help!!

Hi we are new to this we have a 10 year old who was diagnosed with autism 2 years ago, we received the diagnosis and that has been all, we are pulling our hair out as we don't know what to do for the best. Our daughter has been very good at masking things and it was a struggle to get people to take us serious as she didn't display obvious signs in school but we could see it at home. She is very shy does not like public places, struggles to make friends and prefers to just be on her computer. It seems to us that as she is getting older she seems to be getting younger has anyone else experienc this? She is due to go to secondary school in Sept and we are terrified for her as the last year has been extremely difficult for her she continuely thinks nobody likes her and she has no friends s is very withdrawn and overly clingy(maybe not the right word)to us, this is heartbreaking to watch. As a family we feel lost and frustrated and don't know how to help. We would appreciate if anyone can share there experiences with us many thanksCry