Cat owners sometimes blame a new cat food when their cat immediately throws it back up after eating. Food eaten too quickly doesnt get digested well causing your cat to vomit. Cats who eat only dry food oftentimes regurgitate the food almost as soon as they finish.
Sometimes your pet may just eat too fast and expel her entire meal. If you serve your cat refrigerated wet food try letting it come to room temperature first. Due to serious allergies the wet food had to stop. Spoiled food is another culprit as is wet food thats too cold.