User blog comment:WeissSchnee/Character Blog: Ruby Edition/@comment-23784953-20130617003226

Now I cannot unsee an 8-year old Ruby murdering the crap out of a hundred Beowolves with a mini Crescent Rose.

The cross on her belt was replaced with her symbol post-Red trailer. You can see it at Yang's trailer near the end, or the render Monty posted. So that pretty much leaves the only cross on her outfit the ones that are on her cloak.

Following your theory about her past, I consider Ruby to be the type who sees the brighter side of things, so despite all the tragic things that happened to her, she's still happy-go-lucky. Think Cloud Strife with Tidus for a personality.