I think it’s fair. When a clone of your product is funded by the same entity that rejected yours, it's only logical to assess the differences that do exist.
Had she said “as a first-time founder,” I doubt the victim card argument would be raised.
When startups are fundraising or applying to incubators, there is no expectation of confidentiality.
I don't think it's fair to ewe to speculate on why YC rejected her company. What I will say is that incubators judge many factors into why they accept companies; and merely having a good idea, or good insight into what kind of product will succeed in the marketplace, isn't the only factor.
"Investors talk." It's perfectly reasonable to assume that investors would pass along good ideas that come from entrepreneurs who they don't think can bring them to fruition.
That being said, I do think it is poor form on ewe to play the minority status card. Most startups fail, so playing the victim when the odds are against you, just hurts your credibility.
Had she said “as a first-time founder,” I doubt the victim card argument would be raised.