Does shaking hands with one’s uncle’s wife invalidate the ablution?

Question:
Uthman from Jeddah, go ahead, my brother Uthman. Peace be upon you and Allah’s mercy, Shaykh. Peace and Allah’s mercy. I have two questions. Go ahead. The first is that one of these times, the call to prayer for Maghrib was made and I wanted to pray. So I performed the ablution for the prayer, and then my uncle’s wife came. She is an elderly woman, so I greeted her and she shook my hand and I shook hers. I do not know if the ablution was invalidated; I was doubtful about it, but I said, “Madam, she is an elderly woman, there is no harm,” and I prayed.

Answer:
For example, touching a woman. Touching a woman invalidates the ablution if it is for sexual desire, and if it is direct contact without a barrier, direct contact without a barrier, and also for sexual desire. This invalidates the ablution, yes.