I have experienced the bearding but only when I have the wrong side of the batting down. I now look for all those little seeds and put that on the top. I use Warm & Natural for almost everything I do.
I am wondering if it could be the quality of the fabric she pieced with. Some fabric has a lot less stitches per inch and, maybe, that could promote bearding. I don't know what you would do if that is the case.