"Of course. I would never tell anyone if you ask me to."

She does her best to respect people's boundaries. Though the expression on her face goes from worry to confusion, wondering what could it be that she had to keep it a secret. Then she berates herself for thinking. While her promise to Ms. Sommerset comes to mind, Clara doesn't have it in her to betray someone's trust if they explicitly ask it. She has a terrible poker face.

"Cross my heart and hope to die. Again. Stick a needle in my eye." Crossing her hand over her chest and everything. "Not a word I hear from you will pass from these lips. I swear."