After a few exchanges, we agreed that I would write a paid sample. If she was happy with the sample, then she would pay the agreed upon price. If not, then no harm, no foul. I would retain rights to the content sample. The price was CLEAR from the outset, besides also being discounted from my normal rates.
I went about writing the sample and sent the preview to her. She responded back telling me that she could ONLY pay $X - much less than the previously agreed upon rate. CLEARLY, she wanted the content but did not want to pay the quoted rate.
I responded back reiterating our previous agreement and informing her that I would be selling/using the content elsewhere. She then responds back asking me what me what my absolute lowest rate was. I was angry and insulted. If she knew that she could not or did not want to pay the quoted rate, why waste both of our time?
I am not adverse to providing a paid sample, but this is the reason that I require at least a 50% deposit upfront from my clients.