So sorry for your loss of her friend.
I don't know if a chick will be your best choice if she is older. But getting older birds would *possibly* expose her to unknown (even to the seller because it may not have presented yet) disease. Sometimes you do have to take risk though. It's always a very personal decision.
I really like the Easter Eggers a lot. But they have been a real mixed bag of personality as far as friendly verses flighty towards humans. However, they have not been bullies ever... so far. If you have room, you might consider getting 2 friends (even 2 different breeds just for personal variety and fun), in case of any other incident.
If speckled Sussex are available, I've heard good things and they are very beautiful. Though I am growing some out with intention of breeding next year, not enough experience yet to say they are actually great or not. My Silkies all bunked and ranged with my large fowl, until I added roosters to the mix when I separated so they wouldn't be accidentally injured by mating.
I think you can try any breed that you are interested in. Reds (production, RIR, maybe sexlinks and New Hampshire's as well) are about the only ones I will recommend avoiding with your Silkie as they do tend a little more towards the bully side.
For now, I'm sure she will appreciate having chats with you!
Good luck finding her some fantastic flock mates!