Can a hot nodule disappear in thyroid scintigraphy without any therapies?

A 63-year-old woman presented with a history of hyperthyroidism symptoms over two years, referred for thyroid scintigraphy. In the hospital archives we have met her previous thyroid scintigraphy showing a hot nodule in the upper part of right thyroid lobe. However, her recent thyroid scintigraphy was showing only cold nodules but no hot nodule, giving an impression that she had some treatment to her hot nodule. Even though she was advised to medical treatment and also referred for radioactive 131I therapy, she refused all the treatment and she only had some branches of dill (Anethum graveolens) as home remedies whenever she had her symptoms, letting us to think, if it is the dill effect.