that she shouldn't come?

[PILHELP]

DH's sister arrived back in UK last weekend after two weeks in Johannesburg. She wants to come in and pick up some stuff she left at ours this afternoon and I've said it might not be a good idea as she hasn't had the PCR test results (or perhaps even the PCR test for recently arrived travellers yet, I don't know). I've offered to drop the stuff to her. DH has said I'm being ridiculous and thinks it's because I don't like her. I've got to go to an office next week and meet staff that also visit care homes so want to be cautious.

YABU - it's okay for her to come in the house and get the stuff (and have a drink etc)
YANBU - he should do a doorstep handover or let me drop it off at hers

You'd have to be a colossal twat to be wandering around knowing that a new strain is out, and you've just come from the place it is rampaging.

I'd be locking myself away until I knew I was ok and certainly wouldn't be visiting family and friends.

UPDATE so DH took the stuff around while I was out and took our DC, apparently only went in because DC needed the loo. I've not blown up about because I will reserve that for if her test comes back positive. DH has admitted he knows that it was the wrong thing to do so at least he's not in the camp of defending her stupidity.

I wouldn't be as quick to forgive just because he knows it was stupid. I hope it all works out ok though.

YANBU. Viruses with new variants don't care whether you like someone or not.

She is a colossal twat though @Shedmistress and has a complete disregard for anyone else. I don't know how to articulate (without an argument) that by my raising my concerns they ended up choosing a riskier option than just picking it up from the doorstep. I would really like to step away from any contact at all with her but that is going to upset DH. It would have been nice for my feelings to be respected. He would have been really pissed off if she tested positive and he had to isolate for ten days with youngest DC (and the rest of us by virtue of doing the right thing).

FWIW her PCR was negative and I got the "told you it would be". Just a heads up there are idiots out there who were on a plane from SA a week ago who think they are totally in the clear after a day six test and can't get their heads around the fact if they'd arrived a short time later they would be ten days mandatory quarantine so the least they could do is sit at home for a few more days

YANBU.
If she is not keeping to the rules regarding self isolation and PCR test report her to Test and Trace.
Honestly with the new variant and this type of selfish behaviour I despair as we are relying on people doing the right thing.