You've obviously been thinking about this for a long time and it's clear to me that it more than bugs you. Other than more surgery what could have been done to fix it, then or now? Probably nothing other than financial compensation which I think is appropriate. The cost of cropping was likely included in the final price so, they've been paid for it, so should you.
Given that your breeder has all that experience they for sure noticed it, I think they should have offered to compensate you right off the bat. What is the point of them being the trusted expert otherwise? If they think they can continue to use the same vet and expect no backlash, there should be an outcome for that too.
I would say something. Of course you love your dog and accept her as she is (even human ears are not perfectly symmetrical), but you totally have grounds to say something and express your disappointment. You paid a certain price with certain expectations. The best thing would be that they own up to this (because they have gotten away with it and they know it), the worst thing is that you'll discover a different side to them. Either way, you'll be getting an answer that you will be able to move forward with and that's worth your peace of mind.
The best approach is to start off citing the facts as the others have mentioned. Where I differ is that talking about money shouldn't make it confrontational. Why? They run a business not a charity, so it IS all about money. They would not have talked to you without knowing they would be getting paid. Their business is built upon a solid reputation that they should want to protect. How many other dogs ears are done the same way?
Prepare yourself with the possible questions they will come back with so that you can go into it confidently.