Kat wasn't aware that she had said anything wrong. When Cora choked on her water, Katya was surprised and worried for her friend, leaning forward to make sure the other girl was alright. "I am sorry to have offended you! I did not mean for harm to come to you!" she exclaimed worriedly.
When Cora explained that Sol was like her brother, Katya immediately became apologetic. "I am sorry for making the mistake!" she said to Cora, again, reaching into her basket and taking out two more Vatrushki. "Here, have some more treats as an apology for my mistake!"