"I understand that you are very proud of your work. But I am sorry, to me (and others who have seen what I wanted) it looked like a cheap version of the cake I asked for.
Call Kathy/Colette and find out what they charge for this cake. Then forward that to the bride, and remind her that she actually did order a cheap version of the cake she saw!
If she paid $3000, then she has *some* license to be nit-picky. But she did NOT, and....
For $600, (and any amount) that cake is totally incredible. Do not give her a dime; she will not refer you, and she should be too embarrassed to ever order from you again. Seriously, do remind her what others are charging for this caliber work.
You spent a lot of money and many hours creating the exact cake she ordered. It is, after all, food, and is not perfect. None of my cakes are ever perfect, and I never claim them to be. If she were standing in front of the cakes in the photos, she could find flaws in those as well.
Also, you are not a Xerox machine. This is artwork; not an exact copy.
Lastly, her choice of colors (unless she had a 1982 themed wedding, with pieces of Bubble Yum wrapped in tulle as her favors, and bridesmaids in terrycloth tube tops) did not help the cake look upscale and elegant.
Don't hit her with a barage of questions about why she is insane...that will only make you crazy as well! To preserve your good name, and feel like you were fair, sure, offer her $50 off her next party cake. And that should be the end of it! Don't waste any more time/energy on this one. I am so sorry that happened to you. I guess eventually we all get someone like this. Try not to let it get to you!!
(I'd say, she is a cheap version of the bride we ask for.)