Myself is right on about boundaries. Unless the other person knows what they are, she is going to keep riding roughshod all over them. And, of course, she won't know those boundaries until you figure them out and explain them to her. Right now, she knows she gets the shoulder to cry on with no expectations or consequences. It's up to you to figure out what your expectations are and what the consequences should be if they aren't met. Some people will decide to deliver an ultimatum ("Either you get some professional help for this or I won't take your calls anymore...") and others will offer no consequences at all, they'll just keep on doing what they're doing. Some people decide on something in between. It's a tough sitaution and I don't envy you. You're just going to have to find a set of boundaries you can live with.