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She's not cunning, nor manipulative; just lazy. You give her too much credit. I can see where you might be going though. Ultimately, it's up to you whether or not a friend like her is worth keeping. If you do want to keep a friend like her, you should start putting on some limits on how much support you provide her. To change her habits would be a best thing of course, for both her sake and yours but that would be a very tedious process and you really really don't owe her that much.