I have noticed that many of the new batting pkgs say to pre shrink it... I have noticed the all cotton batting gives a wrinkly look. Wool has always shrunk...no dryer for it.Have it dry cleaned or wash with woolite and dry flat. The oldest quilts say to spread a sheet on the ground and dry them out of the sun.
I am lazy and I now use 80/20......the cotton to poly ratio. I do throw it in the dryer with a couple of wet towels to take out any creases and maybe shrink a bit.
I guess it comes down to reading the batting package, or the end of the bolt. Goggle washing batting and see what the newest info is. Things seem to change every few years..
Sorry about your beautiful quilt.
heres one article
http://www.quilt.com/FAQS/BattingFAQ.html