Not to answer for Jadwiga, but it's something I have definitely noticed, along with the usual hysteria of period pigments. If an artisan even mentions that an even marginally toxic/allergenic substance was used in period, it's often treated as if the person had recommended that people should run right out and eat it.

It's the herbal equivalent of assuming I think that people should make poisoned dresses because I mention that there's a legend about an attempted assassination using one.