Hi. How do I blacklist a Seller? Thanks

Hi folks. A seller has black listed me (which must have been accidental), as I have never come across this seller before.  Please can anyone help, as I am interested in buying from her. I have never been blacklisted by anyone and can’t ask her through one of her auctions - because being blacklisted, it appears I can’t ask on her auctions. My own Trademe rating is 99.9%. Thanks for your help