Hi.
1. Yes, eventually she'll get more stuff and things
2. Maybe, maybe not, I haven't planned that far ahead yet!
3. Yes, some of them can already be improved like the rifle or shotgun you mentioned!
4. Yes
5. For now it's just for decoration.
6. Yes, at some point.
7. Yes that is the plan
8. Maybe? I haven't thought about it actually, I read suggestions and ideas posted here. Roxanne being a companion wasn't even my idea.