The vet rang me just after 10 this morning.
Milile had a really good night. They had her on an iv drip which she managed to chew out. She has kept her breakfast down - it is very liquid with a little solid food in. They are keeping her in for the day and will feed her small amounts throughout the day and slowly increase the amount of solids to see if she can keep it down. She is also on medication to help settle her stomach.
The vet (the same one I spoke to last night) is a little concerned that the accident may have caused a hiatal hernia. She wants to speak to one of her colleague to see what he thinks. This in itself isn't life threatening (although it may cause complications later in life, particularly with pneumonia). If they decide that it could be this they may want to investigate further and they can't do that at their vets.
If it is that it can be treated in a number of ways - surgery to remove it (which can be quite invasive as it means going in through the chest), controlling her diet, drugs for life which will help control it. There are lots of degrees of severity for it (I am hopeful that as they have done the x rays and the barium meal thing that if she does have this it isn't severe and won't need surgery).
She did stress that this was only a suspicion and that the main thing was to keep offering Millie more solid food as the day goes on and see how she copes with it. They are going to ring my after 4pm today to let me know how she is getting on and she should be able to come home, even if she is still on the liquid diet.
I have googled it (as you do - bloody fatal google is) and prognosis is good.
So, all in all at the moment I think it is a pretty good diagnosis.