There's nothing to suggest the others aren't there (with the exception of Edie, who might be at her dad's) - she said herself a few days ago that they locked down early, and she won't even let them answer the door, so why would she start breaking rules now??
There’s plenty to suggest they aren’t there if you watch her stories regularly.
Rachel will do what suits her. She took the kids out of school a week before they closed despite none of them being vulnerable yet since then she’s had things delivered almost daily, which is an unnecessary risk as the virus lives on surfaces, she has had people deliver shopping to them despite them all being young and healthy, she’s had her mother in law, who is of an age to be shielding, delivering cakes to their door on a regular basis, she even had an invitation from her mate Astrid last weekend to join them for food, so who knows if that happened
She hasn’t stuck to the rules religiously, she’s done what she always does, which is picked and chosen what suits her.
Let’s not forget she took Wilby to London in March, on the train, to a paid event (and went to a Lewis Capaldi gig) when there were already confirmed cases in London. She does what she wants.