Yeah, bonding - and especially the dominance phase - is not usually something for the faint-hearted! And it is never quite the same, depending very much on the personalities involved, so it never gets easier or any more predictable. You can learn to spot the subtle signs better and understand the dynamics more, but you are still in for the ride on the back of the wild pig...
In my experience, Dee is likely to go right up to the wire, but as Cheeky has been accepted by the others, she will be careful not to step over the line. Give them as much time together today as you can reasonably do and as Dee can stand. Then give everypig a breather and continue tomorrow. You may find that tempers are a lot calmer after a rest and after they have had a chance to work through the roughest bit of the dominance sort-out.
I am always very relieved when that phase is over!