<<Disclaimer: Verify this information before applying it to your situation.>>
I do not know if Cinnamon is GF but I can tell you from my experience working
with a nutritionist that Cinnamon is a very difficult thing to digest. When
I first visited myu nutritionist the first thing she said was no spices, they
are too difficult to digest.
Maybe your wifes digestive system just needs a rest. Cinnamon and other
spices only bother me if I eat them too frequently. The same with other hard
to digest foods like tomatoes etc.
Karyn
South Bend,IN