I would put it through a rinse cycle, take it out and lay it out flat, stretching it to square it up, then let it dry. Of course, all quilts shrink a bit when washed which gives them that antique or country look. It really doesn't look that bad to me, although I'm sure it looks that way to you in person. Good luck...I wouldn't envy you having to skin the quilt and re-quilt.
Sylviak