So sorry to hear about your loss. One of the horses I used to ride 4 years ago was also killed by lighting. Same story as you. Many bigger things around him but he still ended up the one getting hit.
So sorry to hear about what you're going through. The good thing tho is that it would have happened so quickly, that she wouldnt had a chance to see it coming or even know what was going on. Will keep you in my thoughts and prayers.