She was allowed to come home tonight. The doctor said she is very, very lucky. X-rays and everything else were clear. All we have to do is monitor her for a week while she recovers and look out for any warning signs.
She was cycling with my brother-in-law when they heard a crack and the next thing they were lying on the ground with their bikes f**ked up. A tree (or part of a tree anyway) fell on her and scraped my brother-in-law. (What are the chances of a tree falling on you?). One of the bicycles (hers) is completely destroyed while the other can still be repaired. So you must know how lucky my sister is to escape with no serious injuries if the bikes looked like that. She's covered in scrapes, swollen almost everywhere and her helmet is cracked from where the tree hit her. No broken bones, no serious head injuries. I'm not religious but I almost feel like there was something looking out for them.
So relieved!