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File a dispute with AMEX *not mine*. It should be deleted.
If your CC have a history (over 1 year old) and good payment....Yes add her as an AU.
There are times when it takes about 3 months to appear on her CR but can be worth it.
IMO never have a CC in joint names!
You can get a mortgage with both scores and only 1 income.
My read.
If you are applying for a mortgage loan, the lendor does not look just at FICO scores, and who is an AU or joint holder on this or that account.
If you are married, the lendor will review many factors, not only the credit scores, of both spouses, (their incomes, employment history, other debts that may not even be reported to CRAs, etc) that have nothing to do with FICO scoring. I dont think shell games of who is what on each account means a lot for a mortgage loan. They look at the whole picture.