You posted this months ago, so maybe you'll never read it. I wish patients were more educated about late effects of treatments. I had trouble with my thyroid also after radiation treatments. As a patient, I didn't realize that I needed to educate myself. Once I stopped following up with my oncologist, I didn't realize that the average doctor isn't very educated about treatment effects.
I'm glad that your mother is feeling better and I hope that she continues to do well.