I am German. We say "Muschel". I am very sure this lady said "muszla" - I speak 0 Polish but I find it fascinaiting if there is a word we kinda share. Why does google translate tell me Muschel is powłoka though? What is powłoka and what is muszla and what is małż?,(reply>), @Max KopfraumPoops hmm Cracow, Breslau or Danzig would be my choices,(reply>), @Larg04 thank you very much! I want to go to Poland for vacation, where should I go?,(reply>), We share quite a few words, Polish is the slavic language with the most germanic influences, since Germany was always important political  and economical partner. "Powłoka" is a general term for "outer layer" or "coating" and "muszla" is specifically for this hard structure of animals like oysters, snalis or turtles they can hide inside of (though it has also a few other uses, like the bowl part of a toilet is called that too). So I guess "Muschel" is just more versatile word in German, or the trabslator gave you more generic polish word that would be more applicable in more situations since it didn't know what specifically do you mean. And "małż" is the word we use for this kind of animals.