Whenever I get these codes it's a trial and error exercise to figure out what name/zip code combo to use. There are 5 different last names on my account (people that I manage). Have you tried your mother-in-laws last name but your zip code? I used my parents' last name plus my zip code and that is ultimately what worked.My mother-in-law is on our account, too, and even with her name I can't get in online.
Interesting that Pop was $117 for you, and $119 for me. Lucky.
And I assume that AoA rate is for a Little Mermaid room, not a suite.