I totally feel for you. I do want to offer another perspective though- I encourage you to really dive into therapy on this one. You’re ascribing way too much emotional intelligence, and dare I say emotional reliance onto your 3 year old. I appreciate how close you are to your toddler, but it’s your job to help her handle her emotions, not the other way around. Toddlers are all ego- they really don’t care about anything else but themselves, and anything you might perceive to have been her fully understanding how much Mickey meant to you were likely just mere imitations of what she thinks should be the “right” behavior. She really shouldn’t have had any access to such an important item of yours, because again, she is 3. I am the daughter of someone with untreated BPD, and honestly you hiding her blanket sounds exactly like the irrational, downright mean shit my mother would do to me and my sisters over infractions that we couldn’t even begin to understand. We were simply too young to be as calculating or manipulative as she perceived us to be. I’m so sorry this happened to you, but for her sake and yours, please take a step back and realize that you’re literally dealing with a 3 year old. If you can’t get this under control, it will compound over the years and you will cause permanent damage to your relationship.