At least we know we’re not alone @Coco 😩😩
Maybe try playing with games/toys where you take it in turns? Making a point of saying “your turn”, “my turn”. Something like pop up pirate for example. That way she’s practising waiting and watching someone else but knowing that she will get it back soon. Might be worth a try?
My daughter is the same way! Like sharing is the end of the world here for advice as well😩