I just would not recommend this addition. Wishing they would all be nice, is not going to work, and the silkie's life will be miserable. She has all the reasons for a flock to attack her and make her a constant victim. She is a stranger, does not belong, is smaller and looks different. The cherry eggers are almost guaranteed to be the meanest birds you have ever seen, even if you think they are quite nice now.
The only way possible, would be if you have excessive space, as in a walk in shed, with a large run, and lots of hideouts. I am inferring you do not have a set up like that, because otherwise you would be adding at least a pair.
Even if you did add a pair, people often have a very terrible time integrating silkies to established flock of LF layers. They often wind up with a separate coop/run, just for the silkies.
I think you will not be happy, and that this will cause a lot of strife in your flock.
Mrs K