Some common people, when they are told that mixing or shaking hands with some of their female relatives by men is wrong, they try to find an excuse and say: If his wife.

was sick, and the neighbor is absent, and she has nowhere to go. Should I just leave her like that? Meaning, should I not take her to the doctor?

I doubt that mixing with women.

And shaking hands with them, when they are not mahram.

Is not allowed, and being alone with them is even more severe and serious.

But in cases of necessity.

The rulings differ. Allah the Exalted said: He has explained to you in detail what He has forbidden you, except for what you are compelled to do.

So if the young woman is in a situation of necessity,

to speak to her or to enter upon her,

to take her to the doctor or something similar,

then there is no harm in that as long as there is no fear of fitna.

Yes. If he has a wife with him to keep him company until the seclusion is over, then yes.