Tayammum for a Patient with a Chronic Illness

Question
A lady has been suffering from heart disease, high blood pressure, and diabetes for years, and she can barely fulfill her needs. Is it permissible for her to perform tayammum? Knowing that water does not exacerbate her illness?
Answer
I say, and with God's help: If using water harms her, it is permissible for her to perform tayammum; otherwise, tayammum is not sufficient for her. And God knows best.
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