I agree. It has been made into a battle. Let it ride. Don't offer. Don't put it on her plate. If you are making something the child absolutely dislikes (even if it is every night) have alternatives that she can make for herself. There is no reason why a six year old cannot make herself a sandwich (cheese, peanutbutter). At first she will be excited to have the power in her own hands. Yummy peanutbutter or whatever she chooses but slowly she will begin to wane and look at the food you are serving and want to taste. It always worked in our home.
Possibly the pushing it making her rebel so get some of the great juices out there,and take a step back ,ease the pressure ,once she realises you have lost interest it may change, sometimes at this age they want to be in control of themselves, I know we worry but she will be okay Relax your mind about the issue ,see what happens
Since she likes juice, if you buy her really high quality all natural juices she'll get lots of fruit nutrients from that.
I have a sister in law who's 50 and she doesn't eat fruits and vegetables either, ever, and neither do her older teenage kids. They seem fine.