The collection, available at Christie's in New York City until June 23, includes jewelry, furniture and gowns like the ruffled Oscar de la Renta cape dress she wore to the 1990 Tony Awards. The dramatic number is going for $1,200-$1,800.
Melissa hand-selected hundreds of items to sell over the next week, but there were a few things she couldn't let go.
"I kept everything that was on her night table," Melissa admitted.
While Joan always wanted to share her belongings, it was no easy task for Melissa to parcel through the items, which her mother took decades to amass.