Anyone can set up a webshots account for free.
Is it necessary to list who the quiltmaker is? Probably not although we do try to put "Customer quilts" as the heading and the month they were done. A lot of us also list the maker in the description section.
I'm sorry that this is bothering you. Talk to your longarmer and ask her to go in and list the maker of the quilts. I'm sure she won't have any problem doing that.
Why not set up your own account so that people can see the quilts you made?