Oh my Dawn!!! I am so sorry. I remember when you got her. I know you must be just heartbroken.
I have never heard of flopsy syndrome and will be researching and asking vets & experts about it to get educated.
Though I don't have experience with this particular illness, I do know what it is like to lose a bunny. My first bunny died young - he was only 2 years old. He had ecuniculi, and he actually had a negative reaction to meds he was taking for it. I know how hard it is, and I felt horrible, even though I know that with what I knew then I did the best I could. But I know that doesn't make it feel much better. It still hurts. I know you loved her and she had wonderful life with you. So even though her death hurts you, her life was happy and that's a wonderful gift you gave her.
Let's keep each other updated with what more we find out.