"Lucky me that I'm just a witch. But sure, if you're not busy." Part of why Tracey had brought the cat along was to reassure herself that the cat wouldn't be eaten. If the big animal attacked, even if it dealt an immediate death blow, she would've been valid in pulling her wand out and incapacitating the companion. As she saw it, it was better to have it over with. Since Sima hadn't even gotten up, she was guessing that Kellin was likely right about the lack of interest in pets.
"Mm, perhaps I'll encourage him to do it then - with a bow too." So long as she didn't have to clean up blood afterwords.