Apologies for the delay in getting to these. I've been in the midst of exam corrections for the past month. Not the Leaving Cert., by the way. Junior Cert. History.
LOVE your characterisation of Ginny in the first few paragraphs. She really comes across as the independent, firey, perhaps a little overly independent due to being the baby of a long family and fed up of being treated like a little girl that was hinted at in canon.
And actually, I never noticed that about the Weasleys. I never really equated Ron's love of food with Molly's constant cooking.
Hmm, I'm intrigued by this reference to the brother in St. Mungo's.
*grins* Poor Ginny. A bunch of 13 year olds are NOT who you want to run into when you are upset. Actually a boarding school would be a pretty awful place to be when you were upset. It wouldn't be easy to get some privacy.
You've written "it's" for something belonging to "it" when it should be "its". "It's" is short for "it is."
There are a few intriguing hints at House of Stone here. And I really think you characterised Ginny well.