First thing I want to say is...Fiddely, that is one of the funniest stories I've ever heard. I can't believe someone who claims to want to go into psychology first of all can't even spell the word, and second of all doesn't even know who Freud is. I'm sorry, but that's just hilarious.
Which kinda brings me to my next point. Rudeness happens, and when it does, we have to take a mature approach to it, even if just means to not sink down to their level. Stupid people can be very rude, and who wants to deal with stupid people? No one. They all have their own reasons as to why they're rude, whether they feel the need to control others, or they need an ego trip, or something is happening in their life, or whether they were raised to be that way. I don't blame you for messaging the person asking for an apology, but considering the fact that the flamer didn't even read through your message...you might have wanted to approach it a bit more carefully. I think her last response and action relays a message of confusion and maybe even embarassment. If I was her, I would have been embarassed. But see, atleast I would have admitted at being at fault. Instead, she felt insecure and closed herself off from you.
In this case...forgive and forget. She didn't know what she was talking about, and I'm sure if she wasn't so insecure, she would have appologized, which covers the forgiveness aspect. As for forgetting, this kind of thing isn't worth remembering, unless it happens again. In that instance, you will know how better to treat it.
Good luck with your gallery btw