this is not advice but you are going on my favorite sellers list! where I live we cannot get decent clothing in my size and I love your stuff....I will be emailing you with a special item I need...maybe you have one and can list it.
now the advice...she is trying to say you threatened her instead of the other way around...calm down and then reply truthfully..
"nonpayment is rewarded accordingly..thanks for the business"
anyone looking at feedback can tell this person is three cards short of a full deck.