I agree with the others that suggest re-washing it. Then let it either air dry or put it in the dryer only long enough to remove some moisture...just for a little bit...not long at all! When it's damp dry then stretch it ever so gently. You could use painter's tape on the floor or on a table in the size that you want it to be and stretch it to size using the markings as a guideline so that you know where to stretch to get it more even. Then anchor it at key points while it dries so that it keeps it's shape. After it dries I really think it's going to be great...but you could lightly touch up with an iron if need be just to get any really heaving puckered areas smoother...but remember it's the neat puckered quilted areas that make a quilt look like a quilt! Good luck!