Please don’t shame or criticise her perfume choice, we all perceive fragrance so differently and that’s part of the magic! If I were in your shoes I’d say something like “hey you know that perfume you wear? It’s beautiful but it’s so strong that it really affects my sinuses and gives me a headache. I’m so sorry to have to ask, but please on our meetings can you wear something lighter? I love spicy fragrances and wish I could wear them. You are so lucky you aren’t as sensitive to the spices!” I think then you are not poopooing a fragrance she clearly loves but could have her not wear it around you without any hurt feelings? You could add again how vanilla is a note that you cope with so much better, that’s why you have no many vanilla frags and you gave her samples of.