I would say soak her food for sure. My horse used to choke all the time no matter what I did, even from a pan on the ground with rocks in it! I even tried feeding him small amounts at a time, and he would still choke on a handful of grain. He gets equine senior so it's great soaked, and i've been doing it now for about a year and no problems, except he can only get fed at night cause the barn owners won't soak his food. I've also noticed that he won't choke on oats, it's just pellets. I'm also very lucky he has done it enough he stays calm, until he can work it down.