And they understood that she had no aadvantage number yet? Did they at that time sign her up for a number so that when you do call back you will have it. If not, I'd call now. They say no retroactive miles as it comes up on the sabre screen to advise passengers no retroactive miles. I've heard time after time people getting miles afterwards, but only if they get a number straight away and get the "right person."
Good luck.