Try asking her what she meant. Maybe she is hinting for you to make a more adult, pieced one for him to cherish when he gets older and can use/display on his bed.
Personally, I must be the only one here and I don't mean to offend anyone, but I appreciate a pieced quilt much more than a panel. I know a lot more work goes into most all pieced than the panel although there are exceptions. I do feel panel quilts are good for children. They can have their favorite toons with them and yours sounds like it would be perfect for your grandson at this time.