It would be great if the OP could confirm the brand she used. This seems to be a problem with a certain brand (Pellon wool batting). If that was the product used, I assume she didn’t realize it should not be washed in a washing machine or dried in a dryer. I don’t believe most wool battings made by other manufacturers have this limitation.
For Quilter’s Dream: “May be Machine Washed and Dried on cold setting without shrinkage. To prevent loosing the beautiful loft – avoid ironing or using heat. “
For Hobbs: “We suggest washing items made with Hobbs Heirloom Wool Batting by hand, in cool water, and laying them out flat to dry. If you prefer machine washing, items made with this batting may be machine-washed – you should use a gentle cycle and cold/cool water and ensure there’s no heavy agitation or spin during the wash cycle. Be especially cautious with front-loading washers as the intense spin cycle on these machines can be very hard on all elements of your quilts. You may start the drying process of items made with this batting in a cool/air-fluff dryer for 5-10 minutes, however, we recommend you then lay the item flat to complete the drying process.”
For Hobbs Tuscany Wool: “We suggest washing items made with Hobbs Tuscany 100% Wool Batting by hand, or by machine using a delicate cycle and cool water, with no heavy agitation or spinning. Be especially cautious with front loading washers as the intense spin cycle on these machines can be very hard on quilts. To dry items made with Hobbs Tuscany 100% Wool Batting, you may place the quilt in a cool dryer for 5-10 minutes to start the drying process, but we recommend you then air dry the quilt.”