It also should be the exact same as yours or the sponser with “02/03 “ on end, for which number dependent she is. Like my husbands is mine but with 001 on end.
So that may help you memorize her last digits, then just replace them for yours in the future if you don’t have her card on you.
My sons benefits number is my husbands!
Thank you everyone!
It should be on the back of her ID card, or you can check MilConnect !