Don't sweat it, the first person to reply has a grand total of 5 posts. So pretty much also a Noob (at least to posting, if a long time lurker).
To answer the question you first posted. It is hard for anyone to outright rubber stamp your choice, not knowing your wife or the type of ridding intended for the bike. However, having said that the F400 is as you point out an excellent starter bike. And beyond that it is built on an excellent frame if you and your wife wish to upgrade componentry over time as interest increases, the F400 is up to the job.
Enjoy.
NS2000X
PS: Please post pictures when you have it up and running.
Welcome