I was thinking that they made her naive like that as a cheap way to world build for the readers and was about to be really disappointed, but then it also hit me that she might be an other worlder. Like duh, me, I did find this from searching the "reincarnation" theme tag and there's an "isekai" genre tag too lol
Looking forward to seeing where this series goes and if she is an other worlder, will she let the husband know, and when will it happen, you know? this is rhetorical, but if you got spoilers you're willing to share, then please do lol