I'm so sorry for your loss!
As stated previously by Jac, Torsion is something many deep-chested dogs experience. Feeding frenzies where the dogs devour a large amount of food in a short period of time; some stressful event, even minor, (in approximately the eight hours prior to the incident,) a fearful temperament, or consumption of fairly large quantities of non-food material have been suspected of causing it to happen. It's believed that dogs who have several smaller meals each day rather than one or 2 large ones are less apt to develop bloat.
Adding vegetables and canned or meat scraps appears to help lower incidence. Most dogs (60%) bloated not immediately after vigorous exercise soon after a meal, but in mid- to late evening when resting or sleeping.
Because of this, My dogs are grazers. There's always food and water in their dishes so they never get so hungry that they gulp their food. So far we've not had any incidences of bloat feeding this way.
Hope this helps!