They must be doing well with trade
Masha tried never to be completely inaccessible, no matter how she throttled back-and-forth focus on her work (whether voluntarily, due to cooling-and-curing times and artistic patience, or involuntarily, due to a bout of strangely-selective amnesia), but Rozana's...helpfulness was sometimes just a bit too much of a delicious distraction to bear.
"Sure you wouldn't like to know anything I've learned about the best ways of polishing up Mille-Feuille Rocks?"
A ridiculous question: no serious R&Der bothered with such frivolous stones. Rozana thought Masha just so wonderfully, ridiculously, extraordinarily frivolous, so there at the lapidarist's side she loitered, all day.