So sorry to hear this toriap - I can't imagine how awful this must be for you and your dd. On the school issue I have friends who worked with a charity for bereaved children and they say that school can be a really valuable anchor for children in this situation - their life has just been changed forever - school can be the place where they can just be "normal" for a while, laugh with their friends and moan about a teacher. dd2s best friend's mum died when they were 13 - she went into school the next day and only took the day of the funeral off. It was part of her way of coping.
There is a fabulous charity, working to support children through bereavement, called Winston's wish. www.winstonswish.org.uk
School may also have access to bereavement services for children, this is the charity my friends were involved in - Rainbows - they were teachers and this was active in their schools www.rainbowsgb.org
I hope one of these might be useful for your dd - the Winston's wish memory boxes have been a huge success with the children I know who have been bereaved. Your dd (and you if you choose to have one as well) gets a large box and collects things of her dads that carry memories. It might be a birthday card from him, a photo of them together on holiday, items he owned, a book, a pressed flower from the funeral, the order of service, an item of clothing such as a sock.
The key thing is that it's things that trigger memories for her. You can do it with any old box - but the Winston's wish ones are well made and lovely. If you have a friend or relative that wants to do something practical to help then asking them to buy a memory box for your dd is one suggestion. I've bought them for 3 friends of my dd who have lost parents, sadly will have a 4th one to get soon.
Sending you all the positive vibes I can for the next few days and weeks