I might be wrong, but I think Andazzo is just another member who loves cats and happens to work in the field. The spammers usually post once and disappear. Zalensia likes to play mod, and Angel plays expert whether she knows anything or not. But we're taking a chance of losing all three. I would word the pm carefully if I sent one. Each one thinks she's right, and I tend to believe the new member. I wouldn't want to take that kind of insult. Whatever we do will appear to be high handed, so perhaps you could wait?
If I sent a pm, I would use Dale Carnegie's method,* ie: "You are a valuable member to us, but I wanted you to ask you to------" or something else similar in tone.
*That is, compliment first. It's the little bit of sugar that helps the medicine go down!