It sounds to me like she got into someone's purse or something and got into the aspirin. It could actually be a case of aspirin poisoning that may be passing. As long as she isn't losing weight or eye luster, you may be okay, but maybe you could call your vet and confirm? That way, you get an idea of what he/she thinks and if he/she feels you need to bring her in (and please explain what's going on in your family), then maybe your neighbor will be kind enough to take her. I hope it is something that is passing through (literally and figuratively) and she is fine. Are you guys doing okay? Is there anything else we can do to help you out? Hugs and thoughts to all of you.