Can you like take it back to her and leave the rotten stuff on her porch?
currently my mother and father don't have my address any longer they kind of lost my trust a long time ago etc. so they can't mail me anything, they can not show up unannounced or even be "coincidentally" in the neighborhood. It's their own doing.
My mother actually gave me her used underwear if it makes you feel any better 
It's already been tossed in the garbage and hauled away. Even going over to NDoofus' neighborhood would give her the attention she craves and trying to force me to give her ... which would break the NC. I think I figured out what she actually did as I could not find that particular box listed individually. It was a box of six comice pears that WERE PART of a gift tower she received, possibly from her financially well-off sister and brother-in-law, that included chocolate covered cherries, popcorn, mixed nuts, and other goodies. She did NOT want the pears, but hung onto them for awhile until they started to turn mushy and smell strong. Then she wrapped that rotting garbage in fancy wrap and dumped them on my doorstep.
Used underwear?!?!?!?! EEEWWWWWWWWWWWWW!!!! That NWomb-Donor is indescribable!!!!