>>2 That should usually work, but with closest friends it is a little different? I mean, a closest friend is somebody you hold so dear you don't really want to even risk losing and by saying "no", from time to time, sure, you are protecting yourself as you should, but you are endangering the friendship between you and your closest... :(
I wish OP best of luck!! Mmm, perhaps you could try fighting fire with the same fire? You know, just act towards her how she is acting towards you. If she dislikes it, then start making points and she may change her ways..