She rolls her eyes again-- sociopath, all right. No point in saying a farewell to someone she doesn't really want to fare well, so she just silently resumes her walk. There's still the errands to take care of, after all, and lunch to eat.
Once John Hart is out of sight, she takes out her mobile and keys it to the entry for her father. Not labeled that, of course. His end goes to voice mail, so she keeps it brief, still walking as she talks. "Hey, it's me. I ran into someone, don't know if you will too before you get this." She pauses a bit in her message, trying to figure out what else to put in voicemail and what should wait.