Squeezing lemons

My Lemonade Stand Swap doll quilt is this close to being done (imagine my fingers indicating a teen-tiny distance) and I royally messed up the last step. I attached the binding to the front side and was so proud of myself because I nailed all four of the mitred corners. Not a stitch out of place, it was a thing of beauty. Then, I made the fatal mistake of deciding to trim the seam allowance a bit before I stitched the binding to the reverse side. Four quick passes with the rotary cutter and I turned it over to discover I had cut off all four of my perfect corners (insert howl of outrage). How could I have done such a dumb thing? At least it can be salvaged but I hate ripping out seams. Did I mention that the quilt is three weeks late and I have an extension? Or that my swap partner makes gorgeous doll quilts and is a veteran and punctual swapper while I am a tardy amateur? Oy, the pressure.