1. Yes, but just like a chair, the weapon could only really scoot around on the ground like a legless wiener dog... and talk. She needs to touch the weapon too, and if it's in the hands of someone else already, it won't have the strength to disobey them/fuck up their movements. It's essentially pointless to animate a weapon in the first place.
2. If she is sleeping or dead (duh), the object goes back to inanimate-mode. If the object is sufficiently damaged, it'll also deactivate and become unable to be reactivated for awhile. How much damage it needs varies depending on the integrity of the object; obviously a suit of armor would fare much longer than a chair. If it would be damaged such that -were it genuinely alive- it would die, it shuts down.
3. No she has to touch it each time.
4. Yes.