I read it a while ago so don't recall. But now apparently she is claiming it is taken out of context/overblown. She obviously is still on her dad's side regardless of what was in diary.
I think her age would also make a big difference on how inappropriate. Plus, there are a wide range of views on nudity between one extreme of people viewing it as wrong/sinful to the other end of people being nudists with entire family. most people I assume being somewhere in between the two in how lax or strict they are on the matter.
It is a very bad look for biden but unfortunately given our choices, it doesn't turn the needle much.