How about setting up a false wall, maybe out of chicken wire or fencing material within your set up? Isolate the new silkie on the smaller side, and allow the flock to get to know her through it. After several days, add the lowest ranking bird to her, and let them be friends, and then slowly add the next lowest ranking one, etc. At the same time, because they are just separated by a fence/wall, the old flock can see her, smell her, sense her, and your silkie stays safe. After some weeks, you can take the divider off, and see how it goes.
I'm about to add 3 splash Cochin hens to my flock tomorrow, and I plan to do what I described to you. My flock free ranges all day, from morning till dusk, and then they go home to their house. But there is an attached enclosed run, so I plan to set up a divided area in there for the newbies, allow them all to get to know one another, with no bullying allowed.
I plan to segregate them for at least 2 weeks, then let the newbies out to socialize with the established flock. My established flock has silkies and cochins who are very gentle, so hopefully this plan will work out for us.
I wish you good luck.