I don't think it's wrong. If GF isn't going to help, then she doesn't get a vote in the process anyway.
My siblings are spread all over the U.S. so we do things like this via Facebook. My daughter lives 1100 miles away....so we had a baby shower here for her and sent her the gifts and pictures.
I also sent little onsies to various relatives with an envelope addressed to my daughter for them to decorate and mail to her. It was fun for us, and she got the onesies from everywhere, plus people sent other stuff.
Also, if she registers at local stores, out of state people can order through that store and not even have to ship things....she can just go pick it up.
Google it....it's a thing. "long distance baby shower" or something like that.
If you are church goers... then get those ladies involved.
Get the granddaughter involved. She will know who to invite locally....friends and co-workers.
And you are a gooooood Granddaddy for doing this for her....however it works out!