Probably a mix of all the above. I got this a few days ago and it made a lot of sense as well:
You have a very special cat, indeed. A a real sweetie with lots of intelligence, energy, and personality. My theory on the hording under the couch is she is collecting prey, for later use by her and for YOU! If she were an outdoor cat, she is the type of cat that would present you with dead mice as a token of her affection. Take good care of her, keep her inside, and she will be a treasured pet and companion for many years to come.
Thanks all for your replies and patience.