"... And ice cream?"  Zuzia asks seriously, ice cream being a very important part of what should happen when something really bad happened to someone.

"And ice cream, yes."  A bit of a smile.

"Well."  An uncertain sigh.  "That does sound awful, all right.  I wish you the best of luck."  She sounds like she has doubts about how well it will all work out...  But not, in the end, enough of them to call her daughter back, when she can see exactly what they're doing and it's only drawing animals.  (All right, some of the animals are getting eaten, but Zuzia is just like that.)

"What's ice cream?"

Everyone decides that seems like a question for Zuzia to answer.

"It's really good!  And really cold!  And comes in all different flavors like strawberry and coconut and pistachio and cream and chocolate and orange and even more than that!  Sometimes you can get allllll of them!  And it makes you not be sad about anything!"

Marek's guesses about what might make Agnieszka not sad about anything run in a rather different direction, but ice cream can't hurt. 

And a less... five-year-old... explanation might be helpful, first.  "It's mostly cream and sugar, frozen and mixed with different flavors like Zuzia said. They sell it in shops, we can go get some later."

"...and it's not" so expensive no one would ever get it for anyone else unless it came with serious expectations attached "too expensive for most people to be able to just buy it?"