To me, you were practicing good self care when you were genuine with your sister. I can think of a number of reasons why she promises to send a gift, but never does. Maybe she's disorganized, intends to purchase and send a gift to you, then flakes. Or maybe she wants to buy a gift for you, but doesn't have the money to do so.
Whatever the case, it's not thoughtful of her to repeatedly let you down - and you let her know that. Good for you!
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