Didn't want to cause too much of an argument at the time but having worked at a stud for 2 years I have learn't a thing or two.
Sorry to hear though that you wont be hearing the patter of tiny hooves but at least you can start having some fun with her again
He suspects this was not the case because it is rare in older horses and she has always had a tendency to bloat up, although this didn't change when we had her on a paddock paradise type system, but I guess we will never know for sure 
The best is that I can ride her again, this adventure is over for her, but beginning for YO's mare, and Ebs and I are on a new adventure 
nature really is strange
Well, probably all's well that ends well, Ebs is a more mature lady after all and while I'm sure she would have been fine, maybe it's best that she isn't in foal after all IYSWIM.
Although I am very much against over-breeding, on a sentimental fluffy level I am also very glad that the YOs mare hung onto her foal. It's AMAZING how mares do that mind you, you see welfare cases that are quite literally skin and bone, yet they'll still produce a foal - they put everything into their foals and keep nothing for themselves. Hope you enjoy the little one when it arrives, and Ebs too of course
she bloody well showed them! The YO has a good eye for a horse and this little mare is a beauty, she has also shown in hand at county level and her other foal is doing the same I think. Anyway, this is a lovely little blessing to round it all off, and it has given the daughter something to do, she is currently in her room deciding on what she will call the foal! Again, although this mare was deliberately put to a stallion by the previous owner, this was not planned, but will be very very much loved and cared for. And with 3 younger children, all growing up, this little one will have a certain future, as much as that can be said for any horse.
blimey it's like an agatha christie tale lol, Ebs not pregnant but Yo's mare is when she really shouldn't be
whilst i am sorry you have no fluffy foal to play with QB i am very pleased that Ebs is fit and healthy and you get to ride again, as for bloating, i know how she feels lol
but I don't know whether to feel happy for you or even more worried than I previously was. Problem is I'm a breeder and my mares are so important to me that I would always try to figure things out and be searching everything to get to the bottom of this. There is a small window for successfully terminating a pregnancy and providing you inject within that window the pregnancy should (should, not will!) be terminated. If injecting outwith this window then it is very unlikely that the pregnancy will be terminated by injection. So for the vet to say it isn't possible shows a distinct lack of equine reproduction knowledge! I'm not blaming you or your YO as neither of you have this level of equine knowledge .. but an equine vet? Absolutely he/she should know all this basic stuff. Do yourselves a favour and switch vets!
x