There is nothing that you could do. Maybe find something else that reminds you of your cousin. I would offer more, but i am not sure of your ages or how your cousin died.
Tell your aunt how much it would mean to you if you had it.Maybe she would give it to you.I think it is nice to have something to remember our loved by.
grow the hell up! you gotta be outta your dam mind if you think your aunt is supposed to let you have that bear!i understand that was your cousin, but you gotta understand that was your aunts daughter and that bear is probably the only item your aunt has that had any meaning to your cousin.
only if she has that one bear then yea she ir right. but if not she should give you one. or you could ask for something eals. there maybe something you can make and or buy taht may mean a little more then a bear. take it from someone that has been there before. buy a t-shirt and put his/her face on with something that you want to say to that person.
You could ask very nicely if there is something of your cousin's that you may have just to keep in memory of her. As far as the bear you cannot do anything about that. that was your aunts decision and you cannot change that.