Mental health housing issues right of entry

Hi

I have been looking after a career for many years, has mental health issues, and is afraid of strangers, does not have anyone in the house.
Under the terms of the tenancy, have to let the gas engineer in, yearly gas safety check but that's it, no one else comes to the house.
Myself and a few others look after this caree, lets us in the house, to help etc. minor issues.

Very little help has been offered, just left to their own devices.

There is no social worker, no mental health worker, no one is involved or helps.

Suddenly the tenancy organization is wanting to do a welfare check, come into the house make sure the carer is alright.
My carer is scared of this visit and what will happen, doesn't like interruptions to their life.
Apparently the tenancy agency have the right to visit and come in the house, they have never cared or done anything before.
I have tried explaining that the house is their "safe place" and it would damage their mental health with this visit, already my carer is terrified of what will happen, anxiety etc.
But the tenancy organization have little idea about mental health and the impact these visit can cause.
What rights has my career got in this situation, I will be phoning Mind on Monday see what they say?