Ebay - and leaving feedback

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I had an auction for some workbooks, the auction ended, I sent off the invoice, only to have a stroppy email back from buyer asking for a discount in postage !!!.

I stated that I could do a small discount, but did she realise that these books were really expensive and that she had a bargain.

She didn't like this. I offered a refund, didn't want this also. I told her that she should have queried the postage price before bidding on the items.

Sent off items, now left neutral feedback for me. How can I return the feedback for her. I want people to know what a difficult customer this is and that she is so awkward !!

How can I do this, as feedback comes up a leaving a positive comment, which I don't want to give her. Suggestions please ??

I would leave feedback, which has to be positive, but put something like 'poor coms + in future, please ask for a postage discount before bidding'
Block her from bidding from you again, and put 'please ask for details of postage discounts for multiple purchases before bidding' on your listings.

How do you block her bidding from you in the future ?

I always forget so I type in 'block bidders' in the help box (top right corner ish) and then it usually comes up with a link to the block bidders page.