I would be the safest to keep her in a secure crate for now. Maybe as she matures she can move onto the bathroom or a larger area, but as she's still a michevious puppy, I think it's best to crate her.

I personally leave water for mine when/if they are crated, but some people don't like to. I also leave on some soft music or the television for them.

Make sure to let her potty (#1 & #2) before she is crated.