Okay, here is the report on what I decided to do... I put the batting in the washing machine with warm water. I had to convince it to get under water!
I let it set for about five minutes, drain, and spin on the delicate cycle. (I have no idea if it spins differently on the delicate cycle or if that is just for the agitation speed which I did not allow it to do, but just to be sure, I put it on delicate.)
I put it in the dryer on low heat for about 20 minutes. It was still damp when I took it out. I layed it out on a bed overnight to finish drying. In the morning it was dry, all of the wrinkles were gone, and it is still in one piece.
The wrinkles are out now, and hopefully it will shrink less after it is quilted and washed.
Thanks for your guidance ladies!
