did your daughter request invisible thread when she contacted the quilter? quilter's usually use what is requested. it could probably be re-quilted if need be...with regular thread instead of invisible thread. i quilted a quilt for my son years ago which i used invisible thread on- i wound up re-quilting it 3 times before i finally replaced all of the invisible thread ... i hate that stuff! guess it might be ok to use on wall hangings- but i would never again use it on a *used* quilt. but there is a chance your daughter requested it-so that's what she got- the quilter should be notified and talked to-she may be willing to re-quilt it with regular quilting thread.