It has gotten below freezing however they are entirely indoor chickens. They haven’t been exposed to freezing temperatures at all.It looks like the black toe tip and nail have been frostbitten or the circulation has been cut off which can happen with crushing. Has it been below freezing there yet? If a toe gets wet it can become frostbitten if the temperature is cold enough. Usually, when this happens, the toe and nail will eventually fall off. I would dab some iodine or other antiseptic on it daily.
Silkies are actually prone to deformed toes. I have a Silkie Cochin cross with totally deformed toes on one foot. I named her Noodles..I just wanted to mention, that someone had chicks shipped last winter, and after about 2 weeks, the person noticed the toes on one chick were looking dead and shriveling. She found out that the toes were damaged during shipping, since the chicks had always been under a heat lamp since they had arrived. This may not be what caused the black to here, but just a thought.
She was young but her foot definitely was fused in that position. She gets around perfectly fine. Sometimes trips but runs and Roosts like any other bird.A chick vitamin containing riboflavin (vitamin B2) might be helpful, but crooked toes can be permanent at 2 months. If you taped the toes with shoes, that may have helped early on. Usually at this stage, they become permanently a problem.