Fantastic advice so far on this thread - I might use some of it for my own DD!
I'd definately try to find out who lives close to you. You could try contacting their parents, explaining the situation & inviting them round for tea. Or is this too uncool for secondary school?
I do think that the vast majority of Yr 7s are finding things tough. My own DD, who does not normally do worrying, is unable to get to sleep before 10:30 - 11pm as she's terrified of fogetting something & "getting a pink slip". I've tried to explain that the world will not end if she does, but to no avail.
She was also very nervous about going in on her own on the first day. We had made arrangements for her to go in with a friend but it didn't work out. In the end I had to chuck her out of the car near the school gate. She looked at me in horror & said, "Do I have to go in on my own?". "Yup." I answered, "have a super day!"
I spent the whole day feeling guilty and worrying that her first day was doomed to be a disaster. Of course, she had a great day & has happily gone in on her own ever since. Sometimes they need a (gentle and caring) shove.
As for Hockey in the rain - I can't think of anything worse! But I'd never tell my DD that... It's important to try to find a silver lining. They've got to do it (at whichever school they go to) so they need to find a way of enjoying it.
I'm sure she'll be fine before too long.