1. Nope. None so far.
2. This is a bit of spoiler topic since it's a support question, but she doesn't have the hot for Hinoka, rather she has the hot for Kamui, which is obvious. When Hinoka and Camilla support each other, (3rd path only of course) Camilla teachs Hinoka how to do lady behaviors like cooking or sewing. In one of the Rank, Hinoka finds out that Camilla mends Kamui's cape all the time.
3. She's ara-ara type that cares SHIT-TON for Kamui and her family. You can find out from Camilla's support with Kamui.
4. Her face doesn't really betray her body. But in one way, I suppose it does.