I've removed the school name from your first post, as you're giving out quite a bit of personal information.
Your written statement looks unbalanced to me - it's all about extenuating circumstances. There's just a hint of academic evidence in "I have enclosed school reports which highlight **** dip in grades and more recently evidence her hard work which has brought her back inline
", and you mention the sibling as an afterthought (without saying why this matters).
Where have you got to with point 5 mentioned earlier?viewtopic.php?f=35&t=35032"What academic evidence do I need?"
And wasn't point 7 of some help with how to structure a submission?
"Can you help with a letter of appeal (addressing the issues of non-qualification and oversubscription)?
Lots of advice in the Q&As!