If I add my wife as an AU on my Chevron card will it AA her Barclays Rewards card or ruin her chances of a sixth month cli?
Based on the limited information provided -no. Assuming, if course the pyt history on your Chevron is positive and it has a low util it shouldn't hurt her at all. She will of course, have a slightly lowered AAOA due to the new TL but if it's an older TL it could help.
