Meh, if I was in her shoes, despite being "hardy" or not, I wouldn't waste my time with that bs clerk either...I personally would have felt disrespected and walked off too.
Trying to negotiate/haggle in that situation wouldn't be productive and I'd rather sell my shit myself. I know my products are good, (a God of this world taught me my craft) so I'd be feeling myself and say fuck the guild too.
When they try to suck up to me later...tough luck.