As a longarmer, I have had many quilt backs come in that were not wide enough and a few that were not long enough. the reason we need the extra width on the backings is because of the clamps that we use to keep the quilts taut. I generally add 4 or 5" of muslin to the sides for my customers and it makes my job easier as well. Since your quilt is small add some length to the bottom of the backing, It would be best if you had some of your backing left over to attach back on, but if not add some muslin. On large quilts, the quilts shrink as we quilt them, so there is a chance of running out of fabric by the time we get to the end of the quilt. I don't really see a big problem with getting it quilted. if you can't find anyone to quilt it for you, email me and see what we can do to get it done.