You should call her today and ask her for a handout...see what she has to say. "oh hi! I was calling to see if I could shop in YOUR freezer, seeing as how you ordered take out the the other day...I figured you must have gotton your stamps and stocked up..." something to that effect...
My grandmother, bless her heart, is the queen of the guilt trip. She would have said somethign like, "well, why don't you eat leftovers from the cookout?" or "why don't you call a friend that came to your cookout and see if they can host your family for a dinner?"
any my alltime fav...quoting grandma again "theres a lesson in there somewhere."