No sign of illness, she was in good health. DD3 was riding. Dhorse started to go down. DD3 thought she was rolling and managed to get off (thankfully didn't have stirrups on). DH was there but couldn't do anything to help. We are all in shock.
I don't know what to do. DD2 was with me and we got to the stables 5 minutes later. DD1 is coming back home tomorrow so we haven't told her yet - I'm not sure if that is the right decision but she is on her own tonight and has a long drive tomorrow so I'd rather she was home before she finds out.