Bringing them altogether at long last.

Hi all, have put all my hens together this evening, having been segretted for the last 7 weeks. They have been able to see each other but not touch and they have not slept together, tonight is the first night of them being altogether.
It seems okish the youngest hen (martha) is getting the worst of it by the two orginal girls  and flora who is alittle older than martha gets a little peck but nothing as bad. There has been no blood drawn yet! We have given them lots to do, like tree trunks an old metal bin and a chair for them to jump/fly on. Martha seems to want to stay high for safety, and when she thinks it is all clear will jump down for food. Bless her as soon as she does the two oldies (gloria and gladis) peck her straight away.
Will things calm down? Can anyone advise me how long they will give her a hard time for? 
I am really hoping to be the proud owner of a happy flock, who will all become friends.

Thankyou HENrietta