I was told by the breeder that this was a Silkie, but not sure now. Pics below.

Hi there! I bought 3 silkies from a local lady who rasies chicks. Within days, they all died sip ideally, all within 24 hours. I messaged her and tried to get to the bottom of the situation. She offered to replace the first one that died, so I went back out there. She gave me two more silkies and a Legbar. Within less that 36 hours we lost one of the silkies, followed by the Legbar. So, out of 6 chicks, only one lived. I asked around to make sure it wasn't something I had done or not done (I'm a newbie), and more people came forward saying they lost all or most of the chicks bought there shortly after bringing them home. The one "Silkie" left is looking healthy, hyper and is starting to feather out...with feathers that don't look anything like a Silkie. No crest either. It does have 5 black toes, black legs and beak, but I am beginning to wonder if it is a cross.
Also, I have this chick separate from the rest of my existing flock...I just don't want to chance losing any more. When/how should I introduce her to the others? She has to be getting lonely.

Looks like a Smooth Sizzle.

Maybe a Silkie Cochin cross

Silkie cross of some kind.

Thanks y'all. I'm kinda bummed that she isn't a Silkie, but she is adorable anyways. I am very interested to see how she will continue to feather out though. She is actually starting to sprout thinner, Silkie looking features on her shoulders, but I'm not sure if they are just the start of actual feathers or what. No telling what she will end up looking like.