The files you list are probably just installed with iTunes, or iCloud. I use neither so can't be certain.
Obviously, if your wife has installed iTunes or iCloud, they would need reinstalled after reinstalling Windows.
If she has a local library in iTunes (photos, music, etc) then you may want to back that up and restore it, you'll find plenty online articles telling you how. If there are any device backups then you may want to save and restore these too, or alternatively just discard them, then create a new device backup afterwards.
Alternatively, if she is using iCloud for media library and backups then you may not need to backup anything. Depending on storage size, It may also be possible to transfer a local library to iCloud instead of backing up.
Sorry above advice is uncertain - despite my collection of iPods, iPads and iPhones I don't actually use iTunes or iCloud much. I was hoping somebody who knows better might pipe up, and still hoping...?