Thanks guys for your tips. I have tried talking to her about some things, but trying to put it gently. At the moment we work in separate offices, with two offices in between us. She actually suggested that we move into the same office yesterday... so she doesn't have to walk down the hallway when she needs to ask me to do something!
I could never let this happen, we shared an office for the first month I worked here and it was no fun. She looked over my shoulder all day, listenened in & commented on all my phone conversations and frequently asked me to leave the room so she could make sickeningly mushy personal calls herself. My words went something along the lines of "I would really really really prefer to keep my own office", and after a long drawn-out conversation I managed to talk her out of it.
I told her I'm finding it difficult not being able to manage my own time, there are too many things left unfinished, and it's too hard to do all he "little extra things" and admin work for the department (when she's around she controlls every second of my time). She was a bit defensive, stressing how much work she does and saying that all that admin work was always going to be a part of my role (I am an art director). I left work that day thinking that the only option would be to find another job to go to if I wanted to work on more design stuff.
She phoned me after work (she often calls on weekends or after work) and told me not to think she wasn't thinking about what I've said, and do I think it would help if she hired another person to share the workload.
SO we will be getting another person after XMAS, which has made me happy, I just hope they last! & I'm yet to work up the courage to tell her not to treat me so badly.