There is no reason for Mueller to interview her. She’s unreliable, misrepresents herself to everyone, and changes her story constantly. She was denied a visa, then lied about the reason for needing it, showed up at Trump Tower under false pretenses, and has lied about her role multiple times, since. She met Senate Intel members in Berlin. She’s probably not allowed in the country. Even if she was, she would not come here, because she is aware he could be charged, like Van Der Zwaan.