Thanks for your replies.
Harriet and Buffy seem fine now

I am probably incredibly over-cautious with them, but they seem absolutely back to normal with each other. We are very careful with them when food is around - Buffy is crated safely before food is around because I don't want any of the others to get over -enthusiastic near her. Josie wants to lick her all the time, and Buffy is just her usual happy self. She is a bit miffed that she doesn't come out for walks with the rest of the gang - she goes by herself at the moment - but apart from that, she seems fine in herself. No longer scared of the others, or of Harriet at all.
I will find my tape measure tomorrow and order a soft collar for her - in the meantime we are keeping an eye on her and she seems to have stopped worrying at the staples. She has had so many stitches in her little life, she seems to take it all in her stride. None of our other dogs would be as good as she is about all this - she takes her anti biotics and lets me squirt the pain killer straight into her mouth from the syringe the vet gave me, she really is an angel

Will let you know what the vet says after I speak to them tomorrow.