A woman with a foot illness who cannot wash them: how does she perform wudu'?

Question:
Saud from al-Qassim, please, Saud. Peace be upon you. And upon you be peace. Shaykh, may Allah prolong your life and preserve you, my mother has a wound in her foot. Is it permissible for her to perform wudu' with the limbs including the feet, or does she...

Answer:
She performs wudu' with the sound limbs, washing the sound limbs. As for the limb where water cannot be used because it would worsen the illness, she performs tayammum for it. She washes the sound parts and performs tayammum for the unsound parts where water is not suitable. Yes.