I'm really glad that you found us! Yes, we have several members who are dealing with sunflower allergy, including one adult who does.
It's a real bear given how poor labeling can be for allergens outside of the top 8; unfortunately, it often means calling manufacturers to find out what is really in something rather than relying upon the label.
Breads and crackers seem to be the highest risk, but sunflower, sadly, is the new "it" oil and protein, so it can definitely pop up unexpectedly.