You neglected to include this part of my post: "$250 per year, but I get all of that back and then some in credits from different services I use (Uber, dining, etc). Therefore, it costs me $0 out of pocket each year." The Costco card, which I also have (I only carry two cards), doesn't offer 4x the rewards points on dining and groceries. If I traveled more, my Amex Gold would be even more beneficial, but I still get 3x the points on airfare and 2x on hotels when I do travel.At that point in her life the FICO score is mostly meaningless. The only relevant issue is for auto and home insurance which use FICO scores for ratings.
I get over $1K back each year on my Costco CITI card and pay only $65 each year which is the Costco membership. Seems like a better deal than paying $250 a year. Amex is good if a person flies Delta a lot.