I'm a US citizen with Mexican residency, about to marry a dual Guatemalan/Spanish citizen. We are not seeking US residency for her, and likely won't for a long time, if ever. But I want to be sure there won't be any problem visiting my family (in the US) with her in the future.
Once we are married, will there be any difficulty entering the US together, her on a VWP (with her Spanish passport), me as a citizen? Or must she obtain a visa as a family member of a US citizen?