If it is factual that she is an owner of the business and this house is purchased for/through this business, and she is a REALTOR, this would be a violation of disclosure requirements. That should raise a few red flags and portend future deception.
Let's remove this agent from the picture.
If you received a purchase offer from SJ Advantage Investments LLC presented by another agent, what protocol would you observe?
What's the real issue, someone not playing by the rules or the requirement to advise your seller this can turn into a real trap unless you apply unconventional (not by the rules) requirements of the buyer?
Seems as though this agent realized that instead of referring good deals to wanna be investors, she is buying them directly. You should be doing the same thing. But, in a similar situation, I would be happy to say, "Charles, I am the one buying this house. Let's make it happen."
Then you'll ask, 'What's your funding source?" The next month you'll be buying too.
Meanwhile the graduates of the 'Grazzosi' get rich in real estate seminar will be posting messages, "Looking for aggressive, hard working agent who is willing to write cash purchase offers and who is investor friendly." And you'll be asking, "Why aren't these agents buying this real estate themselves?" ...and the world goes round and round.