But Vera is actually right on a “cognitive” level. There’s nothing to cry about. That’s why everybody else finds her so strange — the rest of the family all turn round to look at her and the countess, her mother, asks herself “how did a child of ours come out like this?” (well that’s a rougher translation than — “who does she take after?” “в кого она такая вышла!”) but I think she’s really expressing amazement here — Vera doesn’t fit in this family. There’s an exclamation not a question mark.