
Start off by making sure she hasn't got a free run of the house when you are there. I have found a stair gate invaluable with this, put it across one of the doorways, ie the kitchen or the lounge depending on how your house is designed, so she knows you are around but is not in a position to follow you everwhere. Just for 10 minutes or so at first, if she is quiet then let her out, but don't make a fuss of her when you do so.
Gradually build it up, if you go and have a bath, put her the otherside of the gate, eventually building up so you can pop out to the shops and she settles knowing you will be back.
Important thing to remember is not to make a fuss when you leave her or when you return, then it won't become an issue just a normal part of everyday life.
Good luck
Sandra