User blog comment:Himeyuka/Reyna and Hylla's past/@comment-4523404-20111204131537/@comment-4515675-20111204170103

I think she doesn't like Nico because he's a son of Pluto not for any other reason. She wasn't particularly fond of trusting Hazel either especially when it came to giving her an important position but she seemed much closer to her probably because they shared some sort of affection towards Jason (in Reyna's case probably a crush and in Hazel's probably friendship and a big brother figure) and because Hazel was now part of the legion unlike Nico who is only an ambassador.

I don't think Nico would ever tell the Romans anything about the Greeks and Camp Half-Blood and especially about Percy's weapon. I can't come up with a reason why he would I mean it's not like he owes the Romans anything or is more fond of them. To me Nico simply doesn't take sides.

I honestly don't think she knew about the Greeks because she looked surprised when Percy told her and she questioned him about the Greek campers like she didn't actually believe him. She wouldn't have done that if she knew about Camp Half-Blood. She might have had her own theories from where Percy came from but she hadn't exactly nailed it.