While I have nothing but contempt for Gaines, who has prostituted herself to the transphobic Christian right, the thing is, she isn't in the wrong here.
Trump's posting of an offensive image is the issue here. And Trump knew it was a bad look, because he pulled it down hoping no one would notice.
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If Trump had any humility, he'd say, "I posted this in error because I found it amusing, but should have realized it trivialized the feelings of true believers, and I'm truly sorry for the error."
Of course, Trump is pathologically incapable of doing that, because he sees Christians as suckers.