I wanted to add-on to Mary today as well but couldn't. I took her stored frames out of the freezer a few weeks ago to thaw. Today when i opened the trash bag they were in I saw wax moths. Dang it! So i put them back in the freezer for a few days to kill them off. I thought the trash bag would protect them but was wrong. Oh well, lesson learned.
Mary's new DHB replaces an old DHB only; no new frames. It will be filled with the established frames from the old DHB. It was removed when Mary's population crashed last Winter. She was reduced to a single DHB at the time. The established frames are almost full, with honey & pollen. Though there are some bare areas where I scraped the wax moth damage off.
I'll inspect Mary in a day or so when i can put the new box and frames on. I expect to find the she has filled her current brood box. If so it won't take long for her to fill the holes in the second brood box. That being the case I could feasibly start adding honey supers to her if her population grows fast enough. Her re-queening is still on schedule as soon as the breeder has them available.