As far as I know, DFR is still a physical procedure done when flushing traditionally. You're basically draining the dominant follicle similar to aspirating the ovary during IVF.
If I was you, I would be concentrating on IVF. If treatment shows you can get a window of regression on the cyst, I would shoot for aspiration during that window. Either way, you might only be working with the good clean ovary so reduced production should be expected. Being a heifer without the pregnancy and calving process to mature her, it's going to compound the problem. They also like to be cautious with the FSH on heifers, and for good reason, but it doesn't help with production. If you feel like you have nothing to lose, you might have to push the limits on round two or three before giving up.
If you attempt this, I would make sure to have her in the correct body condition, on an increased plain of nutrition, getting plenty of exercise, on a friendly ration, and only use semen with a collection code that has a history of giving a high egg to oocyte ratio.