My wife has practically no credit, and we're trying to build it up. About 9 months ago I opened a Kohl's store credit card, and added her as a joint cardholder. We recently went through her credit report from experian, and there is no trace of it on her report. I know it's her report because the only item reported there is our main credit card on which she also is a joint cardholder.
What should we do to make sure it shows up on her report?