I'd get out my Stomp 'n' Go pads. Love those things. They get out red wine, spaghetti sauce, popsicles ... just about anything bright & colorful that doesn't belong on the ridiculous white carpet that seems to be in all the apartments I've rented lately (seriously! what a terrible idea! so glad my next apartment has concrete floors).
Those things have dissolved every stain I've ever encountered. They're made for carpet, but I've used them on plenty of other items, including bedding (not quilts so far, but desperate times would have me reaching for them). Just press on them & leave for a bit, then after it's soaked in for a while, work on spot cleaning with cool, clear water and finally toss the quilt in the wash.
But all that said, just don't go near a quilt with any beverage other than water. It's not worth it.