My favorite place is Soke Minamoto Kitchoan at NRT's T2 after passport control. It's more of a tradition Japanese snack place. Since your daughter is in the Seattle area, she should have access to Uwajimaya which have all the standard snacks like Pocky and rice crackers. Here's their US website, their US stores are in SFO and NYC so I visit the NRT or HKG store whenever I can.

https://www.kitchoan.com/

If you're leaving from NRT T1, I think GINZA AKEBONO before passport control may be worth a visit as they sell traditional rice cracker and mochi.