*edit - sorry, this was meant as a reply to the original poster :3
A good owner tries to keep abreast of what's going on in all areas of the
restaurant, and so should spend some time in the bar. A good owner wants to
talk with the patrons and make sure people are having a good time, as well as
keeping an accurate idea about the types of customers to whom she is marketing.
If it is inhibiting your ability to do your job, you may want to bring those
concerns to the owner; frame them as reasons the bar would work better in
certain situations, to show them as legitimate to her concerns.
If you just want to run a bar without anyone else being able to get in your
way, you're probably going to be disappointed until you own your own bar.
> It's her place, you can't really be forceful on this. But you could
> try asking the owner if there is anything she thinks needs to be done
> behind the bar that perhaps you could take care of for her. For
> instance, if she goes to count the register mid-shift or do the
> inventory of the bottles, you could volunteer to do it yourself and
> give her a report.
>
> You can't force your boss to do anything, but you can try and change
> their perspective by offering to help.