@Atemas That's quite all right, you don't need to apologise.
@Jacqui-S Thank you for your understanding comments - I hope it's not bringing back too many sad memories. Thanks too for the advice from
@M.F. 's vet which I read when it was posted but had forgotten about.
Today I'm even less certain we've reached the end. Molly is definitely mentally alert: she is acutely aware when it's mealtimes or kong time, she barks when she sees a cat in the garden as she has always done but isn't randomly barking, she is still picking up a toy or slipper now and then. She can get up to go out to toilet and can get in the car (back seat) with the help of a platform step. She doesn't now want to walk more than a few yards (though yesterday she chose to walk about 50 yards, had a lie down and then walked back to the car.) Indoors she mostly lies down and sleeps (she still chooses to get on the settee).
The newest lump on her leg is ulcerated and looks nasty but I'm hoping the antibiotics will clear the infection.
My last dog died very peacefully in his sleep as did one of my mum's dogs years ago, so I'm hoping for the same thing.