G.B.
Hi A.,
It can be confusing as to what's acceptable. It was the big industry stores who came up with the idea of gift registries, and it was to their benefit they did it, without a care to the goodwill of our society's values.
It IS easier for most people to have a gift registry to use, however, it is NEVER appropriate to put it in a birthday invitation. Even for weddings, where it has become the norm for people to use a gift registry, it would be inappropriate to put it in the wedding invitation. Weddings and birthdays are events where people are invited to "share in our joy." Guests should never be given the idea that they are invited for any other reason. Asking for certain gifts in the invitation can give the recipient a feeling of being used. Even though times have changed, and manners have gone by the wayside, the phsycological response to the request is still the same.
Our society has been a little more embracing with the idea of registries for showers, because the whole purpose of the event IS to shower the person with gifts. (This party was probably the idea of the big store industry too!) In those cases registry info can be put on a wedding shower invitation, but still, even for these events, it can and does feel tacky to some people. And writing in 'gift cards requested' would even be innapropriate on a shower invitation.
The best way to go about this is to have your daughter start telling people about her big plans to redecorate her room. Maybe using such topics as "I'm so excited about my room! I can't wait to get started!Target had everything I wanted but I can't purchase it all right now because we don't have the funds." Leave it at that and hope that people will get some ideas.
Or better yet, only invite one or two kids instead of 20 and use the money you saved to go buy your decorating goods.